A&p II Exam 2 Part 1
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A&P II Exam 2 Part 1
- 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
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