Chapter 11 - The Circulatory System

Question 1

Coronary blood vessels

Answer 1

Blood vessels that circulate to and from the muscle cells of the heart

Question 2

Purpose of the chordae tendineae

Answer 2

Support AV valves; prevent valves from opening backwards under high pressure

Question 3

pericardium

Answer 3

Two layered fluid filled membrane that surrounds the heart and protects it from friction against other tissues and organs

Question 4

3 basic components of the circulatory system

Answer 4

1. Circulatory fluid
2. Tubes
3. Pump

Question 5

systolic vs. diastolic pressure

Answer 5

systolic - pressure in artery when heart contracts

diastolic - pressure when heart is relaxed

Question 6

Difference between the arteries and veins in the pulmonary circuit vs. the systemic circuit

Answer 6

Pulmonary circuit - arteries carry deoxygenated blood, veins oxygenated
Systemic - arteries carry oxygenated blood, veins deoxygenated

Question 7

The right side of the heart pumps blood to the ___ circuit, while the left side of the heart pumps blood to the ___ circuit.

Answer 7

Right - pulmonary

Left - systemic

Question 8

What nerve fibres are located in the septum?

Answer 8

Purkinje fibres (which carry signals from AV node to muscle cells of ventricles)

Question 9

How does air pressure effect breathing?

Answer 9

Lower air pressure makes breathing more difficult, since air moves from area of high to low pressure