Lesson 8, Chapter 2

Question 1

Atria

Answer 1

The two smaller chambers of your heart

Question 2

Ventricles

Answer 2

The two larger chambers of your heart

Question 3

Deoxygenated blood

Answer 3

Blood lacking oxygen

Question 4

Superior vena cava

Answer 4

The vein that brings blood from the upper part of your body to your heart

Question 5

Inferior vena cava

Answer 5

The vein that brings blood from the lower part of your body to your heart

Question 6

The right atrium

Answer 6

The chambers of your heart that receives deoxygenated blood from the superior and inferior vena cava

Question 7

Right atrioventricular (tricuspid) valve

Answer 7

The valve between your right atrium and your right ventrical

Question 8

Right ventricle

Answer 8

The chamber of your heart that receives deoxygenated blood from your right atrium

Question 9

Papillary muscles

Answer 9

Muscles in your heart that contract and relax to open and close the atrioventricular valves

Question 10

Chordae tendineae

Answer 10

The strings that attach the papillary muscles to the cusps of the antroventricular valves

Question 11

One-way valves

Answer 11

Valves that only allow blood to move in one direction

Question 12

Pulmonary semilunar valve

Answer 12

The valve between your right ventricle and your pulmonary trunk

Question 13

Pulmonary trunk

Answer 13

The large blood vessel that receives blood from your right ventricle

Question 14

Pulmonary arteries

Answer 14

Branches of the pulmonary trunk that carry deoxygenated blood to your lungs

Question 15

Pulmonary capillaries

Answer 15

The microscopic blood vessels in your lungs that surround your alveoli

Question 16

Oxygenated blood

Answer 16

Blood that is high in oxygen

Question 17

Pulmonary veins

Answer 17

Veins that carry oxygenated blood from your lungs to your left atrium

Question 18

Left atrium

Answer 18

The chamber of your heart that receives oxygenated blood from your pulmonary veins

Question 19

Left atrioventricular (bicuspid) valve

Answer 19

The valve between your left atrium and your left ventricle

Question 20

Left ventricle

Answer 20

The chamber of the heart that receives oxygenated blood from your left atrium

Question 21

Aortic semilunar valve

Answer 21

The valve between your left ventricle and your aorta

Question 22

Aorta

Answer 22

The large blood vessel that receives oxygenated blood from your left ventricle

Question 23

Self-stimulatory cells

Answer 23

Cells that can contract without input from your nervous system

Question 24

Nodal tissue

Answer 24

Bundles of nervous tissue embedded in your heart that generates electrical impulses

Question 25

Sinoatrial (SA) node

Answer 25

A node that lies in your right atrium and which fires first in you heart's electrical system

Question 26

Atrioventricular (AV) node

Answer 26

A node that lies in the wall between your right atrium your right ventricle and which fires second in your heart's electrical system.

Question 27

Atrioventricular bundle (bundle of His)

Answer 27

A bundle of muscle fibers, located in the interventricular septum, which can conduct electrical impulses.

Question 28

Interventricular septum

Answer 28

The tissue separating your left and right ventricles.

Question 29

Left and right bundle branches

Answer 29

Muscle fibers that branch off of the atrioventricular bundle and carry electrical impulses into your ventricles, causing them to contract.

Question 30

Purkinje fibers

Answer 30

An extensive network of fibers, arising from the left and right bundle branches, which cause your ventricles to contract.

Question 31

Cardioinhibitory center

Answer 31

Neurons in your brainstem that slow down your heart rate.

Question 32

Cardioacceleratory center

Answer 32

Neurons in your brainstem that speed up your heart rate.