Nbde Part 1 (A) By Sd

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  • 1/186 Questions

    Inorganic portion of enamel is?

    • 50%
    • 55%
    • 70%
    • 96%
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About This Quiz

NBDE PART 1 (A) by SD is a specialized quiz designed for dental students preparing for the National Board Dental Examination. It assesses knowledge in key areas such as neurology, pharmacology, and sensory functions, equipping learners with essential skills for their dental careers.

Nbde Part 1 (A) By Sd - Quiz

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  • 2. 

    Stylopharyngues muscle nerve supply

    Explanation
    The stylopharyngeus muscle is innervated by the glossopharyngeal nerve. This nerve originates from the brainstem and provides motor innervation to the stylopharyngeus muscle, which is responsible for elevating the pharynx during swallowing and speaking. The glossopharyngeal nerve also carries sensory information from the back of the throat and the taste buds located on the posterior third of the tongue. Therefore, the glossopharyngeal nerve is the correct answer for the nerve supply of the stylopharyngeus muscle.

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  • 3. 

    Mammary glands drains in to ______ lymph node

    Explanation
    Mammary glands drain into the axillary lymph node. The axillary lymph node is located in the armpit region and is responsible for receiving lymphatic drainage from the breast. This lymph node plays a crucial role in filtering and removing waste products, toxins, and potentially harmful substances from the breast tissue. Therefore, the axillary lymph node is the correct answer as it is directly associated with the drainage of mammary glands.

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  • 4. 

    N-Linked glycosylation occur in

    Explanation
    O-linked glycosylation occus in golgi apparatus

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  • 5. 

    Gallbladder recieve blood from

    Explanation
    Branch of right hepatic artery

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  • 6. 

    Zymogenic cells secretes

    Explanation
    Zymogenic cells secrete pepsinogen. Pepsinogen is an inactive form of the enzyme pepsin, which is responsible for breaking down proteins in the stomach. When pepsinogen comes into contact with the acidic environment of the stomach, it is converted into pepsin, which can then carry out its digestive function. This secretion of pepsinogen by zymogenic cells is an important step in the digestion process, as it ensures that pepsin is only activated when it reaches the stomach and not prematurely in the cells themselves.

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  • 7. 

    Cells located in crypts of liberkuhn

    Explanation
    Mostly in ileum

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  • 8. 

    In heart which adregergic receptors are present?

    • Alpha-1

    • Alpha-2

    • Beta-1

    • Beta-2

    Correct Answer
    A. Beta-1
    Explanation
    Alpha 1 - Vascular smooth muscle ( skin , mucosa , GI )
    Alpha 2 - Presynaptic nerve terminal , platelets , fat cells , Gi tract wall)
    Beta 2 - (Skeletal muscle , bronchial smooth muscle )

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  • 9. 

    The cerebellum controls the following function

    • Sexual activity

    • Sleep

    • Emotion

    • Balance

    Correct Answer
    A. Balance
    Explanation
    hypothalamus - sleep , emotion, sexual activity.

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  • 10. 

    In whic of the following locations would one most likely find yellow bone marrow in an adult?

    • Ribs

    • Diaphysis of femur

    • Epiphysis of humerus

    • Cranial bones

    Correct Answer
    A. Diaphysis of femur
    Explanation
    at birth - all bones are red.
    yellow marrow begins to appears at the age of 7.
    in adult - red marrow - bones of skull , vertebral column , thoraicic cage, the gridle bones, the head of humerus and femur.

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  • 11. 

    DNA synthesis occur in?

    • G1 phase

    • Go phase

    • S phase

    • Mphase

    Correct Answer
    A. S phase
    Explanation
    Protein synthesis occur in all except M phase

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  • 12. 

    Dietary deficiency of ________ results in the inhability to see in dim light ''night blindness ''

    • Vitamin A

    • Vitamin C

    • Vitamin D

    • Vitamin E

    Correct Answer
    A. Vitamin A
    Explanation
    Vitamin C def - scurvy
    Vitamin D def - rickets
    Vitamin E def - poor trasmission of nerve impulse, muscle weakness

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  • 13. 

    Retromandibular vein comprised of?

    • Pterygoid plexus of veins

    • Angular vein and supraorbital vein

    • Superficial temporal and maxillary vein

    • Maxillary and mandibular vein

    Correct Answer
    A. Superficial temporal and maxillary vein
    Explanation
    Maxillary vein - Pterygoid plexus of veins
    Facial vein - Angular vein and supraorbital vein
    Internal jugular vein - Sigmoid and inferior petrosal sinuses

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  • 14. 

    Which of the following is derived from Ectoderm?

    • Dentin

    • Cementum

    • Enamel

    • Pulp

    Correct Answer
    A. Enamel
    Explanation
    Ectomesenchyme ( neural crest) - cementum , pulp , dentin

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  • 15. 

    Complete transaction of nerve trunk?

    • Neurotmesis

    • Neuropraxia

    • Axonotmesis

    • Non of the above

    Correct Answer
    A. Neurotmesis
    Explanation
    Neuropraxia - transient block ( imcomplete paralysis, rapid recovery )
    axonotmesis ( axon damaged but connective tissue sheat intact )

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  • 16. 

    Which of the following cranial nerve is the only nerve that emerges from the dosral aspect of the brainstem

    Correct Answer
    Trochlear nerve
    Explanation
    The trochlear nerve is the only cranial nerve that emerges from the dorsal aspect of the brainstem. It is responsible for controlling the superior oblique muscle of the eye, which helps with downward and inward eye movement. The trochlear nerve originates from the midbrain and exits the brainstem on the dorsal side, making it unique among the cranial nerves.

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  • 17. 

    Development of CNS and spinal cord start in _____ week

    Correct Answer
    3rd
    Explanation
    The development of the central nervous system (CNS) and spinal cord starts in the 3rd week of embryonic development. During this time, the neural tube begins to form, which eventually develops into the brain and spinal cord. The early development of the CNS is crucial for the proper functioning of the nervous system in later stages of life.

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  • 18. 

    The temporal lobe of the cerebral cortex is concerned with ?

    • Voluntary movemnt

    • Visual

    • Somatic sensation

    • Hearing

    Correct Answer
    A. Hearing
    Explanation
    frontal lobe - voluntary movement
    occipital lobe - visual
    somatic sensation - parietal lobe

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  • 19. 

    Which muscle involved in bruxism

    • Masseter

    • Temporalis

    • Buccinator

    • Lateral pterygoid

    • Medial pterygoid

    Correct Answer
    A. Masseter
    Explanation
    The masseter muscle is involved in bruxism, which is the involuntary grinding or clenching of the teeth. The masseter muscle is one of the main muscles used for chewing and closing the jaw. During bruxism, excessive force is exerted on the teeth, causing them to grind or clench together. The masseter muscle, being responsible for closing the jaw, plays a significant role in this process.

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  • 20. 

    Which one do you like?

    • Option 1

    • Option 2

    • Option 3

    • Option 4

    Correct Answer
    A. Option 1
  • 21. 

    The blood supply of mucosa of the nasal septum is derived mainly from?

    • Facial artery

    • Maxillary artery

    • Inferior alvrolar artery

    • Internal carotid artery

    Correct Answer
    A. Maxillary artery
    Explanation
    Greater palatine artery- anterior nasal septum
    ICA - Opthalmic artery - Anterior and posterior ethmoidal artires - anterosuperior lateral wall of mucosa and septum
    Facial artery - anterior part of mucosa

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  • 22. 

    Which cranial nerve has visceral sensory innervation ?

    Correct Answer
    Vagus nerve
    Explanation
    The vagus nerve is the cranial nerve that has visceral sensory innervation. It is responsible for providing sensory information from the internal organs, such as the heart, lungs, and digestive system, to the brain. This allows the brain to monitor and regulate various physiological processes, such as heart rate, breathing, and digestion. The vagus nerve plays a crucial role in maintaining homeostasis within the body and is involved in many autonomic functions.

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  • 23. 

    Otitis media caused by which micro-organism

    Correct Answer
    Streptococcus pneumonia
    Explanation
    Otitis media is an infection of the middle ear, and Streptococcus pneumoniae is a common microorganism that can cause this condition. This bacterium is a leading cause of bacterial pneumonia, as well as other respiratory infections. In the case of otitis media, Streptococcus pneumoniae can infect the middle ear, leading to symptoms such as ear pain, fever, and fluid buildup. Treatment typically involves antibiotics to target the bacteria and relieve symptoms.

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  • 24. 

    Anterior to palatine tonsil is?

    • Palatoglossus

    • Palatopharyngeus

    • Styloglossus

    • Salpingopharyngeus

    • Stylopharyngeus

    Correct Answer
    A. Palatoglossus
    Explanation
    The palatoglossus muscle is located anterior to the palatine tonsil. It is one of the muscles that make up the soft palate and is responsible for elevating the back of the tongue and depressing the soft palate. This muscle plays a role in swallowing and speech production.

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  • 25. 

    With age, the volume of pulp decreases because of?

    • Decrease collagen fibers

    • Formation of secondary dentin

    • Increase cellularity

    • Decrease vascularity

    Correct Answer
    A. Formation of secondary dentin
    Explanation
    As a person ages, the volume of pulp in their teeth decreases due to the formation of secondary dentin. Secondary dentin is a protective layer of dentin that forms on the inner surface of the tooth in response to various factors such as tooth wear, trauma, or decay. This formation of secondary dentin reduces the size of the pulp chamber and therefore decreases the volume of pulp in the tooth.

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  • 26. 

    Most prominent functional component in tunica media in large artries is?

    • Smooth muscle

    • Connective tissue

    • Cells

    • Elastic fibers

    Correct Answer
    A. Elastic fibers
    Explanation
    Smooth muscle in small artries

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  • 27. 

    Dentinogenesis and amelogenesis imperfecta occur during _____ stage

    • Initiation

    • Bud stage

    • Cap stage

    • Bell stage

    Correct Answer
    A. Bell stage
    Explanation
    During the bell stage of tooth development, dentinogenesis and amelogenesis imperfecta occur. The bell stage is the third stage of tooth development, following the initiation, bud, and cap stages. In this stage, the tooth germ takes on a bell-like shape, and the cells differentiate into the different types of cells that make up the tooth, including odontoblasts (which form dentin) and ameloblasts (which form enamel). Therefore, the correct answer is the bell stage.

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  • 28. 

    Heavy smoker with dysphagia and dysphonia

    • Oral cancer

    • Lung cancer

    • GERD

    • Cancer of larynx

    • Rectal cancer

    Correct Answer
    A. Cancer of larynx
    Explanation
    The symptoms of dysphagia (difficulty swallowing) and dysphonia (hoarse voice) are highly suggestive of a problem in the larynx, which is the area responsible for producing sound and helping with swallowing. Cancer of the larynx is a common cause of these symptoms in heavy smokers. Therefore, it is the most likely explanation for the patient's symptoms. Oral cancer, lung cancer, GERD, and rectal cancer are not typically associated with dysphagia and dysphonia.

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  • 29. 

    Most common artery involved in stroke

    • Anterior cerebral artery

    • Middle cerebral artry

    • Posterior cerebral artery

    • Superior cerebral artery

    Correct Answer
    A. Middle cerebral artry
    Explanation
    arteries of stroke - Lenticulostraiate artries

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  • 30. 

    Blastomyces found in

    • Soil

    • Air conditioner

    • Water

    • Cat feces

    • Reheated food

    Correct Answer
    A. Soil
    Explanation
    Blastomyces is a fungal pathogen that is commonly found in soil. It is typically found in areas with high organic matter content, such as wooded areas or riverbanks. The spores of Blastomyces can be inhaled by humans or animals, leading to respiratory infections. Therefore, it is important to be cautious when working or spending time in environments where Blastomyces may be present, such as soil.

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  • 31. 

    The normal T4 : T3 ratio is?

    • 10:1

    • 20:1

    • 30:1

    • 40:1

    Correct Answer
    A. 20:1
    Explanation
    T4 - thyroxine
    T3- triiodothyronine

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  • 32. 

    Which of the following tonsils are covered by ciliated psudostratified columnar epithelium ?

    • Palatine tonsil

    • Lingual tonsil

    • Pharyngeal tonsil

    • Non of the above

    Correct Answer
    A. Pharyngeal tonsil
    Explanation
    Palatine and lingual tonsil - non-keratinized epithelium

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  • 33. 

    Lesion that deviates tongue to the left? 

    • Right hypoglossal

    • Left hypoglossal

    • Left Vagus

    • Right Vagus

    Correct Answer
    A. Left hypoglossal
    Explanation
    Lesion that deviates mandible to left? Left lateral pterygoid

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  • 34. 

    Secretin found where in GI?

    • Stomach

    • Esophagus

    • Duodenum

    • Jujenum

    • Ilieum

    Correct Answer
    A. Duodenum
    Explanation
    Duodenal ulcer(H.Pylori) cause GI cancer

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  • 35. 

    Electrical synapse common in?

    • Cardiac muscle

    • Smooth muscle

    • Skeletal muscle

    • Cardiac and Smooth muscle

    Correct Answer
    A. Cardiac and Smooth muscle
    Explanation
    Electrical synapses are specialized connections between cells that allow for the direct transfer of electrical signals. These synapses are found in both cardiac and smooth muscle. In cardiac muscle, electrical synapses play a crucial role in coordinating the contraction of individual cells, ensuring the synchronized pumping of the heart. In smooth muscle, electrical synapses facilitate the coordinated contraction of cells in organs such as the digestive system and blood vessels. Therefore, the correct answer is Cardiac and Smooth muscle.

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  • 36. 

    Muscle of soft palate except tensor veli palitini supplied by _________

    • Trigeminal

    • Facial

    • Glossopharyngeal

    • Vagus

    Correct Answer
    A. Vagus
    Explanation
    Tensor veli palitini - V3

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  • 37. 

    At what levl does the abdominal aorta bifurcate into the common iliac arteries and also give rise to the middle sacral artery

    • T10

    • T12

    • L4

    • L5

    Correct Answer
    A. L4
    Explanation
    Ascending aorta - left and right coronary arteries
    Aortic arch - Brachiocephalic, Left common carotid , left subclavian
    Descending aorta - thoracic portion t4-t12 , abdominal portion t12-L4

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  • 38. 

    The layer of connective tissue that separates the muscle tissue into small sections is called the

    • Epimycium

    • Perimycium

    • Endomycium

    • Non of the above

    Correct Answer
    A. Perimycium
    Explanation
    Epimycium- surround the entire muscle
    Endomycium- suround each muscle fiber

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  • 39. 

    Which of the following are the most abundant sensory receptors of skin?

    • Free nerve ending

    • Ruffini's corpuscles

    • Pacinian corpuscles

    • Krause's end bulbs

    • Meissner's corpuscle

    Correct Answer
    A. Free nerve ending
    Explanation
    The most abundant sensory receptor are the free nerve endings. Free nerve endings respond to pain and temperature.
    Ruffini's corpuscles - mechanoreceptors.
    Pacinian corpuscles - vibration and rapidly changing pressure.
    Krause's end bulbs are a receptor for fine touch which are located in mucous membranes and the tongue.
    Meissner's corpuscles are also a receptor for fine touch but they are located in the dermis.

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  • 40. 

    Specialized mucosa present in?

    • Gingiva

    • Hard palate

    • Buccal mucosa

    • Dorsal tongue

    Correct Answer
    A. Dorsal tongue
    Explanation
    masticatory mucosa - Gingiva , hard palate
    Lining - soft palate , alveolar mucosa, buccal mucosa, lips, ventral tongue, floor of the mouth
    specialized - dorsal tongue

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  • 41. 

    Muscle of pharynx except stylopharyngeus are supplied by ________ 

    • Trigeminal

    • Facial

    • Glossopharyngeal

    • Vagus

    • Hypoglossal

    Correct Answer
    A. Vagus
    Explanation
    Stylopharyngeus - Glossopharyngeal nerve

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  • 42. 

    Master endocrine gland is?

    • Pituitary gland

    • Thyroid Gland

    • Parathyoid gland

    • Pineal gland

    Correct Answer
    A. Pituitary gland
    Explanation
    Pituitary gland- pea-shaped located in sella turcica of sphenoid bone
    attached to hypothalamus via infundibulum.
    contains its own portal system, two function compartments ( adenophypophysis - ant pituitary , neurohypophysis- post pituitary)

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  • 43. 

    Dry eyes due to injury in which nerve?

    Correct Answer
    Greater petrosal nerve
    Explanation
    Branch of trigeminal nerve

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  • 44. 

    Spinal cord ends around

    • T10

    • L1 - L2

    • L3- L4

    • T12

    Correct Answer
    A. L1 - L2
    Explanation
    Spinal cord terminates at conus medularis

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  • 45. 

    Failure to close the posterior tube 

    Correct Answer
    Spina bifida
    Explanation
    Failure to close the neural tube - anancephaly

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  • 46. 

    Artery found between hypoglossus and genioglossus 

    Correct Answer
    Lingual artery
    Explanation
    The artery found between the hypoglossus and genioglossus is called the lingual artery. This artery supplies blood to the tongue, and it runs deep within the tongue muscles. It branches off from the external carotid artery, which is a major supplier of blood to the head and neck region. The lingual artery plays a crucial role in providing oxygenated blood to the tongue and is involved in various functions such as taste sensation and speech.

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  • 47. 

    What goes between palatoglossus and palatopharyngeus? 

    • CN 7

    • CN 8

    • CN 9

    • CN 10

    • CN 5

    Correct Answer
    A. CN 9
    Explanation
    it also pierces superior and middle pharyngeal constrictors?

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  • 48. 

    After thyroid surgery, pt cannot speak, which nerve?

    • Superior laryngeal nerve

    • Vagus nerve

    • Recurrent laryngeal nerve

    • Hypoglossal nerve

    • Cervical nerve

    Correct Answer
    A. Recurrent laryngeal nerve
    Explanation
    After thyroid surgery, the patient may experience difficulty speaking due to damage to the recurrent laryngeal nerve. This nerve innervates the muscles of the larynx, including the vocal cords, which are essential for normal speech production. Damage to the recurrent laryngeal nerve can lead to paralysis or weakness of these muscles, resulting in hoarseness or loss of voice. The superior laryngeal nerve also plays a role in vocal cord function, but it is less likely to be affected during thyroid surgery. The vagus nerve, hypoglossal nerve, and cervical nerves are not directly involved in vocal cord function and would not explain the patient's inability to speak.

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  • 49. 

    The ________ artery supplies the anterior wall of the body from clavicle to the umbilicus

    • External iliac artery

    • Internal iliac artery

    • Celiac artery

    • Internal thoacic artery

    Correct Answer
    A. Internal thoacic artery
    Explanation
    Inferior epigastric artery is branch of external illiac artery
    Branches of internal thoracic artery
    Anterior intercostal arteries - supply upper 6 intercostal spaces
    perforating arteries - terminal branches
    Pericardiacophrenic artery - phrenic nerve
    Mediastenal arteries - anterior mediastenum (thymus gland )
    superior epigastric artery
    Musculophrenic artery- supply lower intercostal spaces

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  • Mar 20, 2023
    Quiz Edited by
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  • Apr 20, 2016
    Quiz Created by
    C.mart_cruz_95
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