Question 1

What is happening during the phase labeled B? 
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) AV valve closure

Accepted Answer

B

Question 2

What is the purpose of precapillary sphincters?
A) They regulate blood flow to the heart.
B) They change the amount of blood flowing into capillary beds.
C) They are muscles that pump blood back to the heart.
D) They contract when the tissues need more oxygen and nutrients.

Accepted Answer

Precapillary sphincters are rings of smooth muscle located at the entrance of capillary beds. They regulate the amount of blood flowing into these beds by contracting or relaxing, thus controlling the distribution of blood to tissues based on their needs.

Question 3

The flow of blood from the right side of the heart through the lungs and back to the left atrium is called?
A) Pulmonary circulation
B) Coronary circulation
C) Portal circulation
D) Systemic circulation

Accepted Answer

Pulmonary circulation refers to the movement of blood from the right side of the heart to the lungs for oxygenation and then back to the left atrium.

Question 4

Which type of circulation sends nutrient rich blood from the gastrointestinal tract to the liver?
A) Coronary
B) Portal
C) Pulmonary
D) Systemic

Accepted Answer

The portal circulation, specifically the hepatic portal system, carries nutrient-rich blood from the gastrointestinal tract to the liver for processing.

Question 5

How do you know this is a picture of a vein? 
A) There is a lumen.
B) There is muscle present.
C) There is a valve.
D) It has a thick wall.

Accepted Answer

The answer of How do you know this is a...

Question 6

What is the function of the structure labeled B? 
A) It pulls the valves open.
B) It prevents closure of the valves.
C) It prevents the valves from projecting into the atria.
D) It helps push blood from the ventricles into the atria.

Accepted Answer

The answer of What is the function of the structure...

Question 7

What is happening during the phase labeled A? 
A) Semilunar valve closure
B) AV valve closure
C) Atrial depolarization
D) Ventricular repolarization

Accepted Answer

The answer of What is happening during the phase labeled...

Question 8

How do you know this is a capillary? 
A) There is a lumen.
B) It has the simplest structure; very thin.
C) There is endothelium.
D) The branching seen here is only found in capillaries.

Accepted Answer

The answer of How do you know this is a...

Question 9

What is the name of the structure that initiates the heartbeat?
A) AV node
B) Purkinje fibers
C) Bundle branches
D) SA node

Accepted Answer

The SA node, or sinoatrial node, is known as the natural pacemaker of the heart and is responsible for initiating the heartbeat.

Question 10

Which of the following structures delays contraction of the heart?
A) Purkinje fibers
B) SA node
C) AV bundle
D) AV node

Accepted Answer

The AV node delays the electrical impulse to allow the ventricles time to fill with blood before they contract.

Question 11

Regarding structure C, where is the blood heading as it passes this structure? 
A) Head
B) Lungs
C) Heart
D) Body

Accepted Answer

The answer of Regarding structure C, where is the blood...

Question 12

Which letter identifies the tricuspid valve? 
A) A
B) B
C) C
D) D

Accepted Answer

The answer of Which letter identifies the tricuspid valve? 
A)...

Question 13

What is the name of the membrane that surrounds the heart?
A) Pericardium
B) Pleurae
C) Peritoneum
D) Synovium

Accepted Answer

The pericardium is a double-layered membrane that surrounds the heart and the roots of the great vessels.

Question 14

How does Starling's law relate to the heart?
A) Our heart beats faster during extreme stress.
B) Blood pressure increases due to contraction of blood vessels.
C) Less oxygen in the blood will increase the heart rate.
D) The heart beats with more force when there is an increase in blood volume returning to the heart.

Accepted Answer

Starling's law, or the Frank-Starling mechanism, states that the heart's stroke volume increases in response to an increase in the volume of blood filling the heart (the end diastolic volume), due to the myocardial fibers stretching and contracting more forcefully.

Question 15

What is the key risk of hypertension?
A) Genetic damage
B) Arrhythmias
C) Organ damage
D) Stroke

Accepted Answer

The answer of What is the key risk of hypertension?
A)...

Question 16

What is the name of the blood vessels that take blood away from the heart?
A) Arteries
B) Veins
C) Venules
D) Capillaries

Accepted Answer

Arteries are the blood vessels that carry blood away from the heart to various parts of the body.

Question 17

What causes the characteristic heart sounds that a doctor hears when using a stethoscope?
A) The atria contracting
B) The ventricles contracting
C) The closure of the heart valves
D) The opening of the heart valves

Accepted Answer

The characteristic heart sounds, often referred to as "lub-dub," are caused by the closure of the heart valves. The "lub" sound is due to the closure of the atrioventricular valves (mitral and tricuspid), and the "dub" sound is due to the closure of the semilunar valves (aortic and pulmonary).

Question 18

What is the name of the structure labeled A? 
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle

Accepted Answer

The answer of What is the name of the structure...

Question 19

What is the function of the valves in veins?
A) They act as pumps to move blood forward.
B) Collection area for plaque.
C) Prevention of forward blood flow.
D) Prevention of backward blood flow.

Accepted Answer

Valves in veins prevent the backward flow of blood, ensuring it moves towards the heart.

Question 20

Which is the most specific type of circulation that sends oxygen-rich blood to the tissues of the heart?
A) Coronary
B) Portal
C) Pulmonary
D) Systemic

Accepted Answer

Coronary circulation is the specific type of circulation that supplies oxygen-rich blood to the heart tissues.

Quiz 13: The Cardiovascular System

What is happening during the phase labeled B?

What is the purpose of precapillary sphincters?

The flow of blood from the right side of the heart through the lungs and back to the left atrium is called?

Which type of circulation sends nutrient rich blood from the gastrointestinal tract to the liver?

How do you know this is a picture of a vein?

What is the function of the structure labeled B?

What is happening during the phase labeled A?

How do you know this is a capillary?

What is the name of the structure that initiates the heartbeat?

Which of the following structures delays contraction of the heart?

Regarding structure C, where is the blood heading as it passes this structure?

Which letter identifies the tricuspid valve?

What is the name of the membrane that surrounds the heart?

How does Starling's law relate to the heart?

What is the key risk of hypertension?

What is the name of the blood vessels that take blood away from the heart?

What causes the characteristic heart sounds that a doctor hears when using a stethoscope?

What is the name of the structure labeled A?

What is the function of the valves in veins?

Which is the most specific type of circulation that sends oxygen-rich blood to the tissues of the heart?