Chapter 18

Question 1

enclosed and held by pericardium

Answer 1

heart covering

Question 2

pericardium has 2 parts

Answer 2

• fibrous pericardium
• serous pericardium

Question 3

outer thicker layer if fibrous tissue

Answer 3

fibrous pericardium

Question 4

serous pericardium

Answer 4

• divided into parietal (outer) and visceral (inner) layers

Question 5

the space between the parietal and visceral layers; contains pericardial fluid

Answer 5

pericardial cavity
* serous pericardium

Question 6

entire heart muscle behave as a single unit

Answer 6

functional syncytium

Question 7

heart muscle are stimulated by nerves

Answer 7

self-excitable

Question 8

heart wall two layers of tissue

Answer 8

• myocardium
• endocardium

Question 9

myocardium

Answer 9

• cardiac muscle
• many layers, involuntary

Question 10

endocardium

Answer 10

• thin layer of fibrous connective tissue
• lines heart muscle and heart valves

Question 11

two atria are separated by ____

Answer 11

interatrial septum

Question 11

heart has 4 chambers

Answer 11

right atrium (superior), left atrium (superior), right ventricle (inferior), and left ventricle (inferior)

Question 12

two ventricle are separated by ____

Answer 12

interventrucular septum

Question 13

thicker than the atrial wall

Answer 13

ventricular wall

Question 14

thicker than the right ventricular wall

Answer 14

left ventricular wall

Question 15

comb like muscle projections on the inner wall of the
atria that provide rigidity to the atrial wall

Answer 15

pectinate muscles

Question 16

finger like muscle projections inside the ventricles

Answer 16

papillary muscles

Question 17

irregular muscular columns projected from the inner
surface of the right ventricle of the heart

Answer 17

trabeculae carneae

Question 18

is an oval depression on the septal wall of the right atrium

Answer 18

fossa ovalis

Question 19

is an opening in the interatrial septum of the fetal heart – that
corresponds to the site of fossa ovalis

Answer 19

foramen ovale

Question 20

right atrium recieves deoxygenated blood through

Answer 20

• superior vena cava
• inferior vena cava
• coronary sinus

Question 21

from the upper body

Answer 21

superior vena cava
* deoxygenated blood only

Question 22

from the lower body

Answer 22

inferior vena cava
* deoxygenated blood only

Question 23

from heart muscles

Answer 23

coronary sinus
* deoxygenated blood from heart

Question 24

right atrium then delivers deoxygenated blood to the –

Answer 24

right ventricle

Question 25

right ventricle delivers deoxygenated blood to the–

Answer 25

pulmonary trunk