(BSCI 252) Cardiovascular System (pt.2)

System system picks up the blood to go where

to all the cells

How many nuvleus do heart cells have?

1

What does the fibrous pericardium consist of

loaded with collagen fibers to prevent overfilling and thus heart resistence

Systemic vs Pulmonary

S: pumped by left

P: pumped by right

Which ventricle is bigger

the left ventricle is more robust

Why do the heart valves contract?

because of peacmakers

Primary node is the

SA node

Secondary node is

AV node

when the atrium contracts first what happens to the blood in the ventricle

it tops off and so the ventricle then come in contact so their pressure increases as well forcing blood via aorta

does the aorta or ventricle contract faster?

ventricle

are heart or skeletal muscle cells more elastioc

heart cells

what does arotic valves resist?

backflow

when the ventricle relaxes, what happens to blood pressure

it drops

diastolic is

relaxation

systolic is

contraction

is the flow into the aorta faster then its empty?

yes

the ”5”steps of Myocardial action potenital is

4. rest 0. Depolarization (na in) 1. repolarization (k efflux) 2. plateu (calcium influx) 3. Rapid Repolarizqtion (K effluc)

how are ap and peacemaker dif

resets and tge ap is flat

when a second ap occurs then tetaneous contraction occurs

yes

AV node stands for

Anterioventricle

SA node stands for

Sinotrail

How does depolarization help pacemaker

it maintains the cardiac cycle

the 3 phases of peacemaker cells is

phase 4: resting potential (depolarization that is flat) phase 0: Depolarzation (Ca influx) phase 3: Repolarization (K influz

Where is the main PEACEMAKER

in the right atrium

cytoplasm moves cell to cell with what?

demosomes

how is the atria connected to vesicles

the av bundles

the av bundles spread out to

left/ right bundle branch

nodes refers to

muscle cell non contractinf

the septem is

non conductiong

the ability for current to escape and get across is

atrium insulation

why is ventricular depolarization more intence then atrial?

bevause all/ more muscle cells are activated

step to ECG

atrial depolarization (P), ventricular depolarization (R) Ventricular repolarizatuion

how does the cycle begin before ventricles contraction cycle

it begins via venous filling cycle

1 st is ___ 2 nd is ___

lub : dub