A&p II Exam 2 Part 1

15 Questions | By Adchcrash | Last updated: Mar 20, 2022 | Total Attempts: 540

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A&P II Exam 2 Part 1

Questions and Answers

1.

The portion of the intrinsic cardiac conduction system located in the interatrial septum is the:
- A.
  
  AV node
- B.
  
  SA node
- C.
  
  Tricuspid node
- D.
  
  Purkinje fibers
- E.
  
  No correct answer
2.

Which is/are true about extrinsic stimulation of the heart?
- A.
  
  Sympathetic stimulation increase force of contraction
- B.
  
  Vagus nerve stimulation increases heart rate
- C.
  
  Sympathetic stimulation decreases heart rate
- D.
  
  Exercise increases ventricular filling time
- E.
  
  All are correct
3.

Freshly oxygenated blood is first received by the:
- A.
  
  Vena cava
- B.
  
  Right atrium
- C.
  
  Pulmonary artery
- D.
  
  Left ventricle
- E.
  
  Right ventricle
4.

Baroreceptors located in the carotid sinus and aortic arch:
- A.
  
  Sense changes in O2 and CO2 blood levels
- B.
  
  Sense changes in Ca+ blood levels
- C.
  
  Sense changes in venous pressure
- D.
  
  Sense changes in arterial pressure
- E.
  
  Sense chemical and mechanical changes
5.

Which statement does not accurately describe veins?
- A.
  
  Veins have less elastic tissue and less smooth muscle than arteries
- B.
  
  Veins contain more fibrous tissue than arteries
- C.
  
  Most veins in the extremities have valves
- D.
  
  All veins carry deoxygenated blood
- E.
  
  Veins can contain up to 65% of the body's blood volume
6.

Which of the following tissue is responsible for vasoconstriction of blood vessels?
- A.
  
  Elastic tissue
- B.
  
  Smooth muscle
- C.
  
  Tunicca externa
- D.
  
  Collagen tissue
- E.
  
  Adipose tissue
7.

Peripheral tissue and vascular resistance:
- A.
  
  Is inversely related to the diameter of the arterioles
- B.
  
  Tends to increase if blood viscosity increases
- C.
  
  Is directly proportional to the length of the vascular bed
- D.
  
  Increases with sympathetic stimulation due to vasoconstriction
- E.
  
  All are correct
8.

Which of the following could lead to decreased venous return of blood to the heart?
- A.
  
  Increased muscular activity
- B.
  
  An increase in blood volume
- C.
  
  An increase in venous pressure
- D.
  
  Damage to the venous valve
- E.
  
  Sympathetic stimulation
9.

Arterial blood pressure increases in response to:
- A.
  
  Catecholamine release from the adrenal medulla
- B.
  
  Increase in stroke volume
- C.
  
  Increase in heart rate
- D.
  
  Atheriolsclerosis
- E.
  
  All are correct
10.

The structure of a capillary wall differs from that of a vein or an artery because:
- A.
  
  It has a single tunic, only the tunica interna
- B.
  
  It has two tunics instead of three
- C.
  
  It is less fragile than artery or vein walls
- D.
  
  The diameter is larger than arteries and veins
- E.
  
  All are correct
11.

The chemoreceptors in the carotid and aortic bodies are sensitive to:
- A.
  
  Change in arterial pressure
- B.
  
  Change in CO2, pH and O2 blood levels
- C.
  
  Decrease in venous blood pressure
- D.
  
  Changes in arterial elasticity
- E.
  
  All are correct
12.

The myocardium receives its blood supply directly from:
- A.
  
  Pulmonary arteries
- B.
  
  Coronary arteries
- C.
  
  Aorta
- D.
  
  Coronary sinus
- E.
  
  Carotid arteries
13.

Blood flow in the capillaries is slow and intermittent because of:
- A.
  
  Venous valves which plugs up the capillaries
- B.
  
  Large diameter of each individual capillary
- C.
  
  Large cross-sectional area of the total capillary bed
- D.
  
  Thin walls of veins
- E.
  
  Very high blood pressure in capillaries compared to arteries
14.

Which occurs when a depolarization wave travels through the myocardium?
- A.
  
  Decreased Na+ influx, increased Ca+ influx, increased K+ influx
- B.
  
  Decreased Na+ influx, increased Ca+ influx, increased K+ efflux
- C.
  
  Increased Na+ influx, decreased Ca+ influx, increased K+ influx
- D.
  
  Increased Na+ influx, increased Ca+ influx, increased K+ influx
- E.
  
  Increased Na+ influx, increased Ca+ influx, increased K+ efflux
15.

Which of the following statements about the left side of the heart is false?
- A.
  
  Deoxygenated blood returns to the left atrium
- B.
  
  Left ventricle pumps oxygenated blood
- C.
  
  Bicuspid valve or mitral valve is between the left atrium and left ventricle
- D.
  
  Left ventricle pumps blood into the systemic circulation
- E.
  
  Left-sided heart failure results in fluid build-up in the lungs causing pulmonary edema