cardio wk 1

Question 1

How does semilunar valves allow for blood flow? How does it prevent backflow?

Answer 1

blood is forcefully ejected from ventricles -> pushes cusps against the wall –> opens valve

no more blood, pressure decreases –> some blood regurtiates back and fills cusps –> shuts the valve to prevent backflow

Question 2

how does AV valves prevent backflow?

Answer 2

the valve contracts when the venrtles contract –> the chondrae tendie hold onto the valve to prevent it from prolapsing and allowing blood to come back

Question 3

what passes through the diaphragm at T8?

Answer 3

IVC

Question 4

What passes through the diapgramg at T10?

Answer 4

Oesophagus

Question 5

What passes through the diaphragm at T12?

Answer 5

Descending aorta

Question 6

what does the fibrous pericardium do?

Answer 6

protects the heart against sudden over filling

Question 7

papillary muscle

Answer 7

small collection of muscles that that pulls on the chobdra tendia

in atrias

Question 8

What innervation does the vagus nerve supply for the heart?

Answer 8

parasympathetic (rest and digest)

Question 9

where does the lymphaytic nodes of the heart drain into?

Answer 9

left internal jugular + left subclavian –> Left brachiocephalic

Question 10

features of myocardium at high magnification

Answer 10

Intercalated discs
branching cells
centrally located nuclei (uni/binucleated)
striations