Pg Blazer - Online Test Series 23 - Physiology
Subject wise MCQ test - Physiology. For more online practice tests, go to PG Blazer Online Test Series
Questions and Answers
- 1.
ln isometric exercise all are increased except :
- A.
Heart rate
- B.
Cardiac output
- C.
Mean arterial pressure
- D.
Systemic vascular resistance
Correct Answer
D. Systemic vascular resistanceExplanation
In isometric exercise, all factors except systemic vascular resistance are increased. Isometric exercise involves muscle contractions without any movement in the joints. During this type of exercise, heart rate, cardiac output, and mean arterial pressure all increase due to the increased demand for oxygen and nutrients by the muscles. However, systemic vascular resistance remains unchanged because there is no change in blood vessel diameter or constriction.Rate this question:
-
- 2.
Oxygen delivery to tissues depends on all except
- A.
Cardiac output
- B.
Type of fluid administered
- C.
Hemoglobin concentration
- D.
Affinity of hemoglobin for Oxygen
Correct Answer
B. Type of fluid administeredExplanation
The type of fluid administered does not affect oxygen delivery to tissues. Oxygen delivery is primarily dependent on factors such as cardiac output, hemoglobin concentration, and the affinity of hemoglobin for oxygen. The type of fluid administered may affect other aspects of circulation, such as blood volume or blood pressure, but it does not directly impact the delivery of oxygen to tissues.Rate this question:
-
- 3.
True about free water clearance is
- A.
Regulated by ADH
- B.
Regulated by aldosterone
- C.
Increased by furosemide
- D.
None of the above
Correct Answer
A. Regulated by ADHExplanation
Free water clearance refers to the ability of the kidneys to excrete water independently of solute. It is regulated by antidiuretic hormone (ADH), also known as vasopressin. ADH acts on the kidneys to increase water reabsorption, thereby reducing free water clearance. Aldosterone, on the other hand, regulates sodium and potassium balance, but does not directly affect free water clearance. Furosemide is a loop diuretic that inhibits sodium and water reabsorption in the kidneys, leading to increased urine output and decreased free water clearance. Therefore, the correct answer is "Regulated by ADH."Rate this question:
-
- 4.
Aldosterone receptors are present in all except
- A.
Liver
- B.
Colon
- C.
Hippocampus
- D.
Distal nephron
Correct Answer
A. LiverExplanation
Aldosterone receptors are present in the distal nephron, colon, and hippocampus. However, they are not present in the liver. Aldosterone primarily acts on the distal nephron of the kidney to regulate sodium and potassium balance. It also has effects on the colon, where it promotes sodium reabsorption and potassium secretion. In the hippocampus, aldosterone receptors are involved in memory and learning processes. Therefore, the correct answer is liver, as aldosterone receptors are not found in this organ.Rate this question:
-
- 5.
Bile acids are synthesized from
- A.
Cholesterol
- B.
Amino acids
- C.
Bilirubin
- D.
Protein
Correct Answer
A. CholesterolExplanation
Bile acids are synthesized from cholesterol. Cholesterol is a type of lipid that is found in cell membranes and is also a precursor for the synthesis of various hormones and bile acids. In the liver, cholesterol is converted into bile acids through a series of enzymatic reactions. Bile acids play a crucial role in the digestion and absorption of dietary fats. They are released into the small intestine to emulsify fats, allowing for their efficient breakdown and absorption. Therefore, cholesterol serves as the starting material for the synthesis of bile acids.Rate this question:
-
- 6.
Iron is actively absorbed in :
- A.
Stomach
- B.
Duodenum and proximal jejunum
- C.
Large intestine
- D.
Lleum
Correct Answer
B. Duodenum and proximal jejunumExplanation
Iron is actively absorbed in the duodenum and proximal jejunum. These parts of the small intestine are responsible for the majority of nutrient absorption, including iron. The duodenum and proximal jejunum have specialized cells called enterocytes that have iron transporters on their surface. These transporters allow for the active uptake of iron from the intestinal lumen into the bloodstream. Once absorbed, iron is transported to various tissues in the body, where it is essential for functions such as oxygen transport and energy production.Rate this question:
-
- 7.
For PCR which of the following is not required:
- A.
Taq polymerase
- B.
DNTP
- C.
Primer
- D.
Radiolabelled DNA probe
Correct Answer
D. Radiolabelled DNA probeExplanation
PCR (Polymerase Chain Reaction) is a laboratory technique used to amplify a specific DNA sequence. In PCR, Taq polymerase is required as it is the enzyme responsible for DNA synthesis. dNTPs (deoxynucleotide triphosphates) are also essential as they provide the building blocks for DNA synthesis. Primers are necessary as they provide the starting point for DNA replication. However, a radiolabelled DNA probe is not required for PCR. DNA probes are used for detecting specific DNA sequences, but in PCR, the amplification of the target DNA sequence is the primary objective, not the detection.Rate this question:
-
- 8.
Pulmonary circulation differs from systemic circulation
- A.
Pulmonary vasodilation in hypoxia
- B.
Pulmonary vasoconstriction in hypoxia
- C.
Decreased blood volume during systole
- D.
Increased basal vasoconstrictor tone
Correct Answer
B. Pulmonary vasoconstriction in hypoxiaExplanation
In hypoxia, the body responds by constricting the blood vessels in the pulmonary circulation. This is known as pulmonary vasoconstriction. By constricting the blood vessels, the body aims to redirect blood flow to areas of the lung that are better oxygenated, allowing for more efficient gas exchange. This is in contrast to systemic circulation, where vasodilation occurs in response to hypoxia, allowing for increased blood flow to tissues and organs throughout the body.Rate this question:
-
- 9.
Adrenaline, noradrenalinc and dopamine act through
- A.
Single pass receptor
- B.
Four pass receptor
- C.
Seven pass receptor
- D.
Ligand gated channel
Correct Answer
C. Seven pass receptorExplanation
Seven pass receptor (serpentine receptors)Rate this question:
-
- 10.
Increase in threshold level of a nerve on application of a slowly rising sub-threshold stimulus is known as:
- A.
Adaptation
- B.
Accomodation
- C.
Refractoriness
- D.
Electrotonus
Correct Answer
B. AccomodationExplanation
Accommodation refers to the increase in threshold level of a nerve when a slowly rising sub-threshold stimulus is applied. This phenomenon allows the nerve to adapt and respond to different levels of stimulation, ensuring that only relevant and significant stimuli are transmitted. It helps in preventing the nerve from being constantly activated by low-intensity stimuli and allows it to selectively respond to stronger stimuli.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Jul 15, 2011Quiz Created by
Pgblazer
- Bacteria Quizzes
- Bio Quizzes
- Biological Evolution Quizzes
- Biology Exam Quizzes
- Biology Test Quizzes
- Cell Quizzes
- Cell Biology Quizzes
- Chapters Of Biology Quizzes
- Classical Conditioning Quizzes
- Conservation Biology Quizzes
- Enzyme Quizzes
- Fungi Quizzes
- General Biology Quizzes
- Genetics Quizzes
- Immunology Quizzes
- Macromolecule Quizzes
- Marine Biology Quizzes
- Microbiology Quizzes
- Mitosis And Meiosis Quizzes
- Molecular Biology Quizzes
- Parasitology Quizzes
- Prokaryote Quizzes
- Protist And Fungi Quizzes
- Protozoa Quizzes
- Respiratory Quizzes
- Spine Quizzes
- Stem Cell Quizzes
- Taxonomy Quizzes
- Traits Quizzes
- Ultimate Biology Quizzes
- Virus Quizzes
- Zoology Quizzes
Back to top