Circulatory System

Question 1

Red blood cells

Answer 1

erythrocytes

Question 2

shape of red blood cells

Answer 2

biconcave disk

Question 3

cell membrane close to ___

Answer 3

hemoglobin

Question 4

Lose nucleus to _______

Answer 4

make room for oxygen

Question 5

Increase surface area for __

Answer 5

gas diffusion

Question 6

Cannot perform

Answer 6

protein synthesis or cell division

Question 7

Hemoglobin

Answer 7

protein complex that binds oxygen

Question 8

Heme

Answer 8

red pigment contains iron, binds oxygen

Question 9

Globin

Answer 9

4-part protein complex, binds CO2

Question 10

Red blood cells are produced in

Answer 10

red bone marrow (adults)

Question 11

Erythropoietin hormone

Answer 11

produced by kidney/liver in response to oxygen deficiency

Question 12

Dietary needs

Answer 12

B-complex vitamins: B12 + folic acid for DNA synthesis

Question 13

Macrophages destroy

Answer 13

damaged RBC

Question 14

Hemoglobin broken down into__

Answer 14

amino acids + iron

Question 15

Average life span

Answer 15

100-120 days

Question 16

Epicardium

Answer 16

“at the heart” protects the heart by reducing friction

Question 17

Myocardium

Answer 17

“muscle of the heart”, cardiac muscle

Question 18

Cardiac skeleton

Answer 18

dense network of connective tissue collagen + elastic fibers that reinforce + anchor muscle fibers

Question 19

Endocardium

Answer 19

“inside the heart”, inner layer

Question 20

Atria (plural) - Atrium (singular)

Answer 20

“entryway”, upper chambers, receive blood returning to heart

Question 21

Auricles

Answer 21

small, ear-like projections “small ears”, increase atrial volume

Question 22

Ventricle(s

Answer 22

“underside, lower chambers”, receive blood from atria, contract to force blood out of heart

Question 23

Septum

Answer 23

separates heart into right and left