week 8 circulatory Flashcards
what does the circulatory system transport
oxygen, fuel molecules (nutrients), hormones, white blood cells
what does the cardiovasculary system get rid of
co2
lactate (lactic acid)
urea
what is the pulmonary circuit
blood vessels go to and from the lungs
what is the systemic circuit
blood vessels to and from the rest of the body
what are the chambers of the heart
- atria (atrium) two upper chambers
- ventricles two lower
what direction does blood move through the heart
from right to lungs to left to the rest of body
what is the septum
divides the left and right sides of the heart
the right ventricle pumps blood through the…
pulmonary circuit
the left ventricle pumps blood through the…
systemic circuit
the wall of the left ventricle is thicker why?
because systemic circulation has higher pressure than pulmonary
what controls the direction of blood flow through the heart
the valves
what is unique about the heart muscles
cardiac muscles are anatomically interconnected
when one fiber contracts all fibers contract
electrical conduction in myocardial cells, how does it occur?
- auto rhythmic cells spontaneously fire action potentials
- depolarization then spreads through the gap junctions
ap in contractile cells
sa node
interneural pathway
electrocardiography
helps us understand the electroactivity in the heart by recording the wave of depolarization
tachycardia
HR is faster than normal
bradycardia
HR is slower than normal
what supplies the heart with blood
the coronary arteries
pressure reservoir ARTeries
maintains pressure and continues to drive blood forward
arterioles - blood flow
adjust their diameter and allow blood to flow or constrict blood flow
capillaries (blood flow)
exchange between cells and tissues
venules
collect blood and send back to lungs
Sino-atrial SA node
Heart’s pacemaker, found in the right atrium
Generates electrical impulses to start the heartbeat
Fires at 60-100 bpm at rest
what is arrhythmia
an irregularity in the rythm of the heart beat
