Chapter 42: Circulatory system

Question 1

What is diffusion proportional to

Answer 1

• Square of the distance

Question 2

What consists of circulatory system

Answer 2

• A muscular pump (heart)
• a circulatory fluid
• a set of interconnecting vessels

Question 3

What is open circulatory system

Answer 3

• Heart pumps blood into hemocoel

Question 4

What is closed- circulatory system

Answer 4

• Heart pumps blood into vessels

Question 5

Veins belong to oxygenated or deoxygenated blood

Answer 5

• Deoxygenated blood

Question 6

Capillaries belong to oxygenated or deoxygenated blood

Answer 6

• Oxygenated blood

Question 7

What types of species have single circulation

Answer 7

• Bony fishes

Question 8

What types of species have double circulation

Answer 8

• Mammals, reptiles, amphibians

Question 9

Pulmonary circuit vs systemic circuit

Answer 9

• pulmonary circuit at the lungs

- systemic circuit from body

Question 10

Why mammals and birds heart has four chambers

Answer 10

• As they’re endotherms, they need more energy to get O2 in and CO2 out of the body

Question 11

What is cardiac cycle

Answer 11

• Indicates the rhythm cycle of heart contract and relax

Question 12

What is systole

Answer 12

• The contraction, pumping phase

Question 13

What is diastole

Answer 13

• The relaxation or filling phase

Question 14

How many valves heart have

Answer 14

• Four (2 AV valves and 2 Semilunar valves)

Question 15

What is the natural pacemaker in the heart

Answer 15

• SA node

Question 16

What is the name of the highest pressure in the arteries

Answer 16

• Systolic pressure

Question 17

What is the name of the lower pressure in the arteries

Answer 17

• Diastolic pressure

Question 18

What is the formula of cardiac output

Answer 18

Stroke volume x Heart rate

Question 19

Vasoconstriction vs Vasodilation

Answer 19

• Increases blood pressure vs decreases blood pressure