CH 19 Heart Part 1

Question 1

Arteries only carry oxygenated blood?

Answer 1

False! Most but not all carry oxygenated blood (Pulmonary trunk)

Question 2

Veins only carry deoxygenated blood?

Answer 2

False! Most do but not all carry deoxygenated blood

Question 3

Which side of the heart has oxygenated blood?

Answer 3

Left

Question 4

Which side of the heart has deoxygenated blood?

Answer 4

Right

Question 5

List all the great vessels.

Answer 5

1. Pulmonary trunk
2. Aorta
3. Superior and inferior vena cava
4. Pulmonary veins

Question 6

What is the purpose of heart valves?***

Answer 6

Allows blood to flow in only one direction. And prevent backflow

Question 7

Pulmonary circulation sends blood to the?

Answer 7

Lungs

Question 8

Systematic circulation sends blood to the?

Answer 8

Entire body

Question 9

Superior vena cava collects blood from?

Answer 9

Brain and superior part of body (above arms)

Question 10

Inferior vena cave collects blood from?

Answer 10

Inferior part of body (below arms)

Question 11

The heart is enclosed in a sac called the ___?

Answer 11

Paricardium

Question 12

What structures are covered by endocardium?***

Answer 12

1. Internal surface of the heart
2. External surface of valves
3. Linings of blood vessels

Question 13

Desmosome function?

Answer 13

Interlock cardiac muscle (prevent heart from falling apart)

Question 14

Gap-junction function?

Answer 14

Allows passage of ions

Question 15

What are intercladed disks made of?

Answer 15

Desmosomes and gap-junctions

Question 16

What is the coronary circulation purpose?

Answer 16

Provide the heart with its own private circulation

Question 17

What influences the heart beat?***

Answer 17

The ANS

Question 18

Conduction system function?

Answer 18

Ensure proper timing of contractions

Question 19

Cardioacceleratory***

1. Which ANS division?
2. Neurotransmitter?
3. Binds to?

Answer 19

1. Sympathetic
2. NE
3. Beta 1

Question 20

Cardioinhibitory***

1. Which ANS division?
2. Neurotransmitter?
3. Binds to?

Answer 20

1. Parasympathetic
2. ACh
3. Muscarinic

Question 21

Heart is innervated by which ANS division?***

Answer 21

BOTH (Dual innervation)

Question 22

Which ANS division affects contraction force and touches the heart itself?

Answer 22

Sympathetic

Question 23

Nodal cell function?

Answer 23

Initiate action potential (heart beat)

Question 24

Resting membrane potential of nodal cells is? (RMP)

Answer 24

-60mV (not stable)

Question 25

Na+ channel speed of nodal cells?

Answer 25

Slow

Question 26

Ca2+ channel speed of nodal cells?

Answer 26

Fast

Question 27

K+ channels are not slow or fast, instead they are?

Answer 27

Voltage gated

Question 28

SA nodes exhibit?

Answer 28

Autorhythmicity (Automatic contractions)

Question 29

Opening and closing of heart valves are caused by?***

Answer 29

Pressure gradient