Name: ___________________
Biology 100: Human Biology
Quiz #5
1. Arteries (1 pt.)
a. carry blood away from the heart.
b. carry blood towards the heart.
c. have valves.
d. Both a and b are correct.
2. Blood flowing to the lungs leaves the heart via the ______ and returns to the heart via the
_____. (1 pt.)
a. aorta; superior vena cava
b. superior vena cava; aorta
c. pulmonary arteries; pulmonary veins
d. aorta; pulmonary veins
3. Which of these correctly traces the path of blood from the left ventricle to the head? (1 pt.)
a. left ventricle to subclavian artery to head
b. left ventricle to pulmonary artery to head
c. left ventricle to aorta to carotid artery to head
d. left ventricle to vena cava to jugular vein to head
4. What is the function of the heart valves? (1 pt.)
a. to push blood
b. to prevent backflow
c. to stimulate the heart
d. to give support to the heart
5. The vena cava (1 pt.)
a. carry blood to the right atrium
b. carry blood away from the right atrium
c. join with the aorta
d. have a high blood pressure
6. The chamber of the heart that receives blood from the pulmonary veins (1 pt.)
a. is the right atrium
b. is the left atrium
c. contains O2-rich blood
d. contains O2-poor blood
e. a and c
f. b and c
g. b and d
7. The coronary arteries carry blood (1 pt.)
a. from the aorta to the heart tissues
b. from the heart to the brain
c. directly to the heart from the pulmonary circuit
d. from the lungs directly to the left atrium
8. Describe the major difference between the pulmonary circuit and the systemic circuit in
relation to arteries and veins. (4 pts.)
In the pulmonary circuit, the pulmonary artery carries O2-poor blood from the
heart to the lungs. From there, the pulmonary veins carry O2-rich blood back to the
heart. In the systemic circuit, the aorta carries O2-rich blood away from the heart,
while the vena cava carries O2-poor blood towards the heart.
9. What is the pathway of the blood through the heart from the vena cava to the lungs? (3 pts.)
Vena Cava---Right Atrium---Atrioventricular Valve---Right Ventricle---Semilunar
Valve---Pulmonary Artery---Lungs
10. What is the pathway of the blood through the heart from the lungs to the aorta? (3 pts.)
Lungs---Pulmonary Veins---Left Atrium---Atrioventricular Valve---Left Ventricle--Semilunar Valve---Aorta
11. Why is it advantageous to have an increased heart beat during exercise? (3 pts.)
During exercise, the body needs an increased supply of oxygen, and as compared to
when at rest. To do this, the heart beat increases, which causes an increase of blood
flow across the lungs, which results in increased oxygen. The increased heart rate
also increases rate of blood flow, which allows the oxygenated blood to reach the
tissues faster.