Chapter 42: Circulatory system Flashcards
1
Q
What is diffusion proportional to
A
- Square of the distance
2
Q
What consists of circulatory system
A
- A muscular pump (heart)
- a circulatory fluid
- a set of interconnecting vessels
3
Q
What is open circulatory system
A
- Heart pumps blood into hemocoel
4
Q
What is closed- circulatory system
A
- Heart pumps blood into vessels
5
Q
Veins belong to oxygenated or deoxygenated blood
A
- Deoxygenated blood
6
Q
Capillaries belong to oxygenated or deoxygenated blood
A
- Oxygenated blood
7
Q
What types of species have single circulation
A
- Bony fishes
8
Q
What types of species have double circulation
A
- Mammals, reptiles, amphibians
9
Q
Pulmonary circuit vs systemic circuit
A
- pulmonary circuit at the lungs
- systemic circuit from body
10
Q
Why mammals and birds heart has four chambers
A
- As they’re endotherms, they need more energy to get O2 in and CO2 out of the body
11
Q
What is cardiac cycle
A
- Indicates the rhythm cycle of heart contract and relax
12
Q
What is systole
A
- The contraction, pumping phase
13
Q
What is diastole
A
- The relaxation or filling phase
14
Q
How many valves heart have
A
- Four (2 AV valves and 2 Semilunar valves)
15
Q
What is the natural pacemaker in the heart
A
- SA node
