Course
Human Biology
Study Pack
Set 13 The Cardiovascular System
Question 1
(Multiple Choice)
Free
What is happening during the phase labeled B? 
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) AV valve closure
Answer
Question 2
(Multiple Choice)
Free
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.
Answer
Question 3
(Multiple Choice)
Free
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
Answer