HISTOLOGY (Circulatory System)

Question 1

consists of a closed
network of vessels that transport materials
to and from the cells of the body.

Answer 1

circulatory system

Question 2

heart to capillaries

Answer 2

arteries

Question 3

capillaries to the heart

Answer 3

vein

Question 4

the circulating fluid (a milky substance)

Answer 4

lymph

Question 5

⚬ It is a hollow muscular organ about the size of
a clenched fist and has a mass of 2.2kg.

Answer 5

heart

Question 6

The upper chambers

Answer 6

atria

Question 7

the lower chambers

Answer 7

ventricles

Question 8

are bigger and thicker

Answer 8

ventricles

Question 9

is the number of times the heart beats every minute

Answer 9

heart rate

Question 10

the heart muscles relaxes, allowing blood to flow into the atria and ventricles

Answer 10

• DIASTOLE

Question 11

the ventricles contract, pumping blood to the body

Answer 11

SYSTOLE

Question 12

sound of the heartbeat that is heard in stethoscope caused by closing of the heart
valves

Answer 12

“lub-dub”

Question 13

Connective Tissue that covers the HEART

Answer 13

pericardium

Question 14

outer sac which envelops the central
mediastinum, made up of Dense
connective Tissue

Answer 14

Fibrous Pericardium

Question 15

inner sac

Answer 15

Serous Pericardium

Question 16

thinnest layer, lines the innermost surface of the heart
and is continuous with the innermost layer of great
blood vessels

Answer 16

ENDOCARDIUM

Question 17

thickest layer of the heart, consists mainly of Cardiac
Muscle Cells

Answer 17

MYOCARDIUM

Question 18

outermost layer, connective tissue enveloped by
simple squamous epithelium

Answer 18

EPICARDIUM

Question 19

⚬Lining material that facilitates the flow of
blood through the blood vessels

Answer 19

ENDOTHELIUM

Question 20

⚬Simplest among blood vessels

Answer 20

CAPILLARIES

Question 21

muscles, lungs, CNS, Skin

Answer 21

Continous (Type I)

Question 22

GI tract, Endoc. Glands, pancreas, glomerulus

Answer 22

Fenestrated ( Type II)

Question 23

parenchyma of liver, spleen, bone marrow

Answer 23

Sinusoidal (Sinusoids)

Question 24

￭ innermost layer, endothelium and subendothelial layer, mostly Loose CT, occasionally
Smooth MT

Answer 24

Tunica intima

Question 25

middle layer, smooth muscle fibers

Answer 25

⚬Tunica media

Question 26

outermost layer, Connective Tissue

Answer 26

Tunica adventitia

Question 27

Relatively thin wall and big lumen

Answer 27

venule

Question 28

*Relatively thick wall and small lumen.

Answer 28

arterioles

Question 29

Thick media composed of smooth muscle cells.

Answer 29

muscular arteries

Question 30

Thick media composed of sheets of elastic fibers interspersed with layers of smooth muscle cells.

Answer 30

elastic arteries

Question 31

collects interstitial fluid (lymph) that leaks from blood vessels into connective tissue, and return it to blood

Answer 31

lymphatic system