Test 1

Question 1

Why is the L.Ventricle more muscular then the R.Ventricle?

Answer 1

It contracts with force sufficient to push blood through the systemic circuit.

Question 2

What event is taking place during the Q-T interval?

Answer 2

A single cycle of ventricular depolarization and repolarization.

Question 3

What statement is true of peptide hormone?

Answer 3

They are chains of amino acids such as glycoproteins, small proteins, or polypeptides.

Question 4

Which of the following is true of cardiac muscle tissue?

Answer 4

Cardiac muscle cells have intercalated discs.

Question 5

What characteristic of blood contribute to its high viscosity?

Answer 5

Interactions among proteins, formed elements and water molecules in plasma.

Question 6

What characteristic is exclusive to the endocrine system compared to the nervous system?

Answer 6

Effective in coordinating cell, tissue, and organ activities on a sustained, long-term basis.

Question 7

What condition contributes to a reduction in the size of the T wave?

Answer 7

Coronary ischemia

Question 8

What is not a major function of blood?

Answer 8

Storage for calcium ions

Question 9

How is eversion of the AV valves and back flow of blood into the atria prevented?

Answer 9

Tightening of chordae tendineae and contraction of papillary muscles.

Question 10

Why is resting HR somewhat slower than the 80-100 bpm set by the SA node?

Answer 10

Parasympathetic effects dominate in a resting individual.

Question 11

How does damage to the cardioinhibitory center of the medulla affect heart rate? why?

Answer 11

Heart rate increases; sympathetic dominance

Question 12

If levels of calcium are low in the blood, what hormone would restore calcium to homeostasis?

Answer 12

Parathyroid Hormone

Question 13

During ventricular systole of the cardiac cycle, what would not occur?

Answer 13

Pressure in ventricles would force the semilunar vales closed.

Question 14

Why is cross matching performed, even though both donor and recipient are known to be the same blood type?

Answer 14

It reveals the presence of potential cross-reactions with surface antigens other than A, B, and Rh.

Question 15

Frank has just run marathon and his heart is beating extremely rapidly. What happens to the length of diastole and filling time?

Answer 15

Both decrease

Question 16

What is the phase in cardiac cycle when the mitral valve is closed and the aortic valve is open?

Answer 16

Systolic ejection phase

Question 17

What is the effect of renin secretion by the kidneys?

Answer 17

Converts into angiotensinogen to angiotensin 1

Question 18

What is the best way to describe Platelets?

Answer 18

Adhere to collagen beneath endothelium

Question 19

During the cardiac cycle do ventricles contain their maximal amount of blood? what is this quantity called?

Answer 19

At the end of atrial systole; EDV

At the end of ventricular diastole; EDV

Question 20

A substance that activates plasminogen might be useful to?

Answer 20

Cause clot dissolution to proceed faster.

Question 21

Why is ESV lower when you are actively exercising?

Answer 21

EDV increases and ventricular muscle produces more forceful contractions ejecting more blood.

Question 22

Which phase is after Vascular?

Answer 22

Platelet phase

Question 23

The vascular arrangement of the hypophyseal portal system?

Answer 23

Provides efficient means of ensuring that all hypothalamic hormones will reach target cells in the adenohypophysis before being diluted in general circulation.

Question 24

In cardiac muscle, the fast depolarization phase of the action potential is the result of?

Answer 24

Increased membrane permeability to sodium ions.

Question 25

Why can’t a person with type A blood safely receive blood from a person with type B blood?

Answer 25

Type B blood would agglutinate in the recipients blood vessels and plug small vessels to vital organs.

Question 26

Failure of the zone glomerulosa to secrete aldosterone would result in?

Answer 26

Loss of Na+, K+ retention , and decreased reabsorption’s of water at the kidneys.

Question 27

On an ECG reading, what does the P wave indicate?

Answer 27

Atrial depolarization

Question 28

Why do high levels of cortisol, a steroid hormone from the adrenal cortex, cause a decrease in the pituitary secretion of ACTH?

Answer 28

ACTH participates in a negative feedback loop with cortisol.

Question 29

What does insulin do?

Answer 29

It facilitates the transport and utilization of glucose by cells. It promotes protein synthesis.

Question 30

Andrew has blood type O negative. What type of blood can he receive from a donor? Why?

Answer 30

O negative; he has anti-A and anti-B antibodies in his plasma.

Question 31

Blood is supplied to the myocardium by?

Answer 31

Coronary arteries

Question 32

What is the role of LH in males?

Answer 32

Stimulates production of testosterone

Question 33

Sam has an infestation of large parasitic worms. Which of the following will happen?

Answer 33

Eosinophils will release cytotoxic enzymes from their granules.