exam 1 review Flashcards Preview

A&P2 > exam 1 review > Flashcards

Flashcards in exam 1 review Deck (86)
Loading flashcards...
1

where does apex point?

towards the left hip

2

which layer of the heart wall consumes the most energy?

myocardium

3

what causes the plateau portion of the action potential in contractile cardiac muscle cells?

an influx of calcium ions

4

where does the stimulus for the heart's rhythmic contractions come from?

a pacemaker potential

5

which structure is responsible for setting the hearts pace?

SA node
(Sinoatrial node)

6

why is the SA node the pacemaker?

it depolarizes the fastest

7

what would happen if the AV node became the pacemaker?

the rhythm would be slower

8

which heart abnormality has no P waves on an otherwise normal ECG?

junctional rhythm

9

what does input to the heart from the cardioinhibitory center primarily affect?

the SA node and AV node

10

what causes the lub sound?

closing of AV valves

11

what causes the dub sound?

closing of Semilunar valves

12

which blood vessel components is most critical in regulating systemic blood pressure?

tunica media

13

the ability to recognize and bind to a specific antigen

Immunocompetence

14

what contains the majority of the body's blood volume at any one time?

systemic veins and venules

15

why has pulse pressure disappeared by the time blood reaches the capillary beds?

the muscular arterioles do not exhibit elastic rebound

16

what effect does a long period of skeletal muscle inactivity have on blood flow?

it causes blood pooling and slowing of blood flow

17

the major factor controlling stroke volume during resting periods?

venous return to the heart

18

what do baroreceptors detect changes in?

stretch in arterial walls

19

hormone that will help lower blood pressure

atrial natriuretic peptide

20

why is vasodilation prominent in the skin when a person increases physical activity?

heat is dissipated across the skin from the blood to help cool the body

21

primary mechanism driving filtration in capillary beds?

hydrostatic pressure within the capillaries

22

what creates capillary colloid osmotic pressure?

nondiffusible plasma proteins

23

anaphylaxis

a severe allergic reaction

24

where does blood from the digestive organs empty into before going through the liver?

hepatic portal vein

25

major vessel delivering deoxygenated blood to the lungs

pulmonary trunk

26

which vessel receives blood drainage from the liver and returns it to the heart?

inferior vena cava

27

what portion of the hemoglobin does oxygen bind to?

iron atom

28

what does an elevated neutrophil count indicate?

an acute bacterial infection

29

antihistamine counters the actions of which white blood cells?

basophils

30

the progenitor of platelets

megakaryocyte