Circulation learnsmart

Question 1

Which of the following has a four-chambered heart like humans?

Answer 1

Birds and some reptiles.

Question 2

Cnidaria and flatworms exchange gases and remove wastes by way of their

Answer 2

gastrovascular cavities.

Question 3

When you step on a cockroach or smash a fly, the blood appears colorless because

Answer 3

it does not contain hemoglobin or any other respiratory pigment.

Question 4

Which organism has hemoglobin located in the fluid portion of the blood, giving it a red appearance?

Answer 4

earthworm

Question 5

Which would you find in the heart of a fish?

Answer 5

one atrium and one ventricle

Question 6

What would you find in the heart of a human?

Answer 6

two atria and two ventricles

Question 7

What would you find in the heart of an amphibian?

Answer 7

two atria and one ventricle

Question 8

“Artery” and “vein” are defined by whether they leave or enter the heart. If they were defined by whether they carried oxygenated or deoxygenated blood, we would have to change the name(s) of

Answer 8

the pulmonary artery and vein; they would have to be switched.

Question 9

Which organisms will contain hemolymph as the fluid of their circulatory system? (3)

Answer 9

grasshopper
sea star
molluscs

Question 10

A heart murmur is a distortion of the heartbeat due to blood flowing back through a valve that should be closed. If the heart sound is lub-dub-ssshhh, the most likely cause is a failure of the

Answer 10

atrioventricular valves.

Question 11

What is the main difference between an open circulatory system and a closed one?

Answer 11

An open system will have the blood leave the blood vessels and dump into the hemocoel while the closed one will retain the blood within the system.

Question 12

The vessels in our circulatory system that allow molecules to diffuse across to tissues are

Answer 12

capillaries.

Question 13

Which structure does blood pass through immediately before entering the right atrium?

Answer 13

vena cava

Question 14

Which statement is NOT true about red blood cells?
They are biconcave disks that lack nuclei when mature.
Their normal life span is about 120 days.
Hemoglobin is a protein that binds oxygen loosely to transport it.
There are about 6 million red blood cells per cubic millimeter of whole blood.
They are mainly produced in the liver.

Answer 14

They are mainly produced in the liver.

Question 15

Which type of blood component is involved in the initiation of clotting?

Answer 15

platelets

Question 16

The human heart is composed of muscle fibers called___and an outer membranous sac called the___and the___

Answer 16

myocardium, pericardium, endocardium.

Question 17

Veins primarily depend upon which of the following forces to return blood to the heart?

Answer 17

skeletal muscle contraction

Question 18

Which of the following cardiovascular diseases is caused by a narrowing of the arteries causing the heart to work harder when pumping?

Answer 18

hypertension

Question 19

A person who is B positive will have

Answer 19

B antigens, antibodies to A, and Rh antigens.

Question 20

Major cardiovascular disorders include all of the following EXCEPT
atherosclerosis.
stroke.
hypertension.
diabetes.

Answer 20

diabetes.