Mastering

Question 1

The right and left atria depolarize and contract following the arrival of the action potential from the __________.

Answer 1

SA Node

Question 2

The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is called __________.

Answer 2

Preload

Question 3

How much blood is pumped from each ventricle during the ventricular ejection phase?

Answer 3

70 ml

Question 4

Calculate the end-systolic volume (ESV) if the end-diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.

Answer 4

40 ml

Question 5

Autorhythmicity in the heart is the responsibility of __________.

Answer 5

cardiac pacemaker cells

Question 6

Inotropic agents affect __________.

Answer 6

contractility

Question 7

Which hormone decreases cardiac output by decreasing blood volume and preload?

Answer 7

Atrial Natriuretic peptide

Question 8

Which of the following decreases heart rate?

Answer 8

Acetycholine

Question 9

What largely determines preload?

Answer 9

End-systolic volume (ESV)

Question 10

A damaged atrioventricular (AV) bundle or atrioventricular (AV) node will primarily affect the length of the __________.

Answer 10

P-R interval

Question 11

Blood in the right atrium should travel next past the __________.

Answer 11

tricuspid valve and into the right ventricle

Question 12

What normally serves as the pacemaker of the entire heart?

Answer 12

Sinoatrial Node (SA node)

Question 13

During what part of the action potential will calcium ions enter the contractile cell?

Answer 13

Plateau phase

Question 14

Which of the following can be used to measure heart rate?

Answer 14

R-R interval

Question 15

Which pressure remains the same along the length of the capillary?

Answer 15

Colloid osmotic pressure

Question 16

Which blood vessels experience the sharpest decrease in blood pressure?

Answer 16

systemic Arterioles

Question 17

What name does the femoral artery take as it emerges in the posterior thigh?

Answer 17

Popliteal Artery

Question 18

Which of the following hormones decreases heart rate, and thus cardiac output and blood pressure?

Answer 18

Acetylcholiine

Question 19

Under what conditions will the myogenic mechanism slow blood flow into a capillary bed?

Answer 19

Rising Arteriolar Presusure

Question 20

What type of capillaries have large pores within their endothelial cells and are the leakiest?

Answer 20

Sinusoidal capillaries

Question 21

Blood pressure is equivalent to __________.

Answer 21

hydrostatic pressure

Question 22

Determine fluid movement when hydrostatic pressure exceeds colloid osmotic pressure at the arteriolar end of the capillary.

Answer 22

Water is pushed out of the capillary by filtration

Question 23

Which of the following connects vessels through vascular anastomoses?

Answer 23

Collaterals

Question 24

Into which vein does blood in the external jugular vein drain?

Answer 24

Subclavian Vein

Question 25

What type of capillaries have large pores within their endothelial cells and are the leakiest?

Answer 25

Sinusoidal Capillaries

Question 26

What is the average value for mean arterial pressure (MAP)?

Answer 26

95 mm Hg

Question 27

What is the largest artery in the body?

Answer 27

Aorta

Question 28

Which vessels serve as the blood reservoirs of the body?

Answer 28

Veins

Question 29

What hormone is released to decrease blood pressure?

Answer 29

Atrial Natriuretic Peptide (ANP)

Question 30

Blood Pressure is equivalent to ….?

Answer 30

Hydrostatic pressure

Question 31

Which pressure remains the same along the length of the capillary?

Answer 31

Colloid Osmotic Pressure