Ch 19_Exam 1: The Heart Flashcards Preview

A&P II: BIO426 > Ch 19_Exam 1: The Heart > Flashcards

Flashcards in Ch 19_Exam 1: The Heart Deck (36)
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1

Name the four chambers of the heart.

  1. Left Ventricle
  2. Right Ventricle
  3. Left Atrium
  4. Right Atrium

2

What is the name of the valve between the right atrium and ventrical?

Right AV (atrioventricular) or Tricuspid valve

3

What is the name of the valve between the left atrium and left ventricle?

Left AV (atrioventricular) or Bicuspid valve.

4

What is the name of the valve leading from the right ventricle to the pulonary trunk?

Pulmonary semilunar valve

5

What is the name of the valve leading from the left ventricle to the aorta?

Aortic semilunar valve

6

Name the four valves of the heart.

  • Left AV / Bicuspid valve
  • Right AV / Tricuspid valve
  • Pulmonary valve
  • Aortic valve

7

What vessel takes blood from the heart to the lungs?

Pulmonary arteries

8

What vessels bring blood back from the lungs to the heart?

Pulmonary veins

9

What are the 3 layers of the heart?

  1. Epicardium
  2. Myocardium
  3. Endocardium

10

What vessels bring blood back to the heart from the body?

Superior and Inferior vena cava

11

What blood vessel takes blood from the heart to the tissues and organs of the body?

Aorta

12

What is the blood flow of the heart starting with the vena cava?

  • Superior and Inferior vena cava bring deoxygenated blood from the body to right atrium
  • Right atrium flows to right ventricle through tricuspid/right av valve
  • Right ventricle delivers blood to the pulmonary trunk through the pulmonary valve
  • Pulmonary trunk splits blood flow to go to the lungs through the left and right pulmonary arteries
  • CO2 is expelled and O2 is picked up at the lungs and delivered back to the left atrium through the pulmonary veins
  • Oxygentated blood is pumped to the left ventricle through the bicuspid/left av valve
  • Blood leaves the left ventricle through the aortic valve to the Aorta. 
  • Oxygenated blood is distributed to the tissues and organs of the body

13

The SA node is also known as the...

Sinoatrial node

14

The AV node is also known as the... 

Atrioventricular node

15

The AV bundle is also known as the...

Atrioventricular bundle

16

The intrinsic conduction system is also known as the 

cardiac conduction system

17

The intrinsic conduction system is responsible for regulating...

the heart beat

18

The ____ node is the pacemaker of the heart.

SA node

19

Describe the intrinsic conduction cycle

  1. SA node in upper right atrium fires
  2. Excitation flows through the atrial myocardium
  3. AV node in lower right atrium fires
  4. Excitation spreads down AV bundle
  5. Subendocardial conducting network distributes excitation through ventricular myocardium

20

Define Systole

The contraction of the heart muscle

21

Define Diastole

The relaxation of the heart muscle

22

What are the four steps of the cardiac cycle?

  1. Veintricular filling
  2. Isovolumetric contraction
  3. Ventricular ejection
  4. Isovoumetric relaxation

23

Cardiac cycle:

Explain Ventricle Filling 

  • Blood flows passively into atria
  • Atrial contraction (atrial systole)
  • AV valves open
  • Semilunar valves close
  • Ventricle is in diastole (relaxation)
  • Causes ventricles to fill with blood

24

Cardiac cycle: 

Explain Isometric Contraction 

  • No change in volume
  • creates high pressure
  • forces semilunar valves to open
  • blood leaves ventricle

25

Cardiac cycle: 

Explain Ventricle Ejection 

  • Ventricles contract
  • Close AV valves (1st sound of heart)
  • Atria in diastole

26

Cardiac cycle: 

Explain Isovolumetric Relaxation 

  • Blood leaves ventricle
  • Pressure drops
  • Semilunar valves close (2nd sound of heart)
  • Results in ventricular diastole (relaxation)

27

Cardiac Output:

Measures the effectiveness of... 

heart contractions

28

Define Cardiac Output

The amount of blood pumped out of the heart in 1 minute.

29

Define Heart Rate

The number of times the heart contracts in one minute.

30

Define Stroke Volume

The amount of blood pumped by 1 ventricle per heart beat.