Cardio Flashcards
sinoatrial node (SA)
known as pacemaker, in the upper wall right artrium, accepts pulse from conduction system of the cardiac system
atrioventricular node
in the wall of right atrium, accepts pulse from conduction system of the cardiac system
conduction system 1st phase
cardiac cycle, triggers impulse in sinoatrial node, spreads to right & left artria causing them to contract and filling ventricle with blood
conduction system 2nd phase
impulse reaches the atrioventricular node travels along the atrioventricular bundle down the right and left branches of the septum
conduction system 3rd phase
from within the septum the impulse travels down to the Purkinje fibers, causing the filled ventricles to contract
purkinje fibers
in the walls of the ventricles
systole
contraction of the heart. pushes blood against the walls of the arteries at a maximum pressure
diastole
follows the systole, is the rest phase where pressure is at a minimum where the ventricles relax and refills, recoils
external control of heart
cardiac center of the brain, modulated by epinephrine and norepinephrine
myocardium
heart
pericardium
sac around the heart, contains the four chambers
median septum
divides the four chambers
atria
2 superior, left/right are the receiving chambers
ventricle
2 inferior, left/right are the pumping chambers
right side of the heart
pumps deoxygenated blood from the heart to the lungs, known as the pulmonary
left side of the heart
receives oxygenated blood from the lungs and pumps out to the rest of the body, known as systemic
atrioventricular valve
separates the atria and ventricles
arterioles
smaller arteries. Arterioles connect to capillary and capillary beds to distribute blood
venules
smaller veins, thinner, they are farther away from the blood pressure. connect the veins to the capillaries
lymph vessels
thin walled and have one way valves that carry lymph.. Afferent lymph vessels flow into lymph nodes, while efferent lymph vessels flow out of them.
lymph fluid
it is blood plasma that gets cleaned through lymph nodes and returned to the cardiac system by veins
inferior vena cava
The inferior vena cava is a vein. It carries deoxygenated blood from the lower half of the body to the right atrium of the heart.
AV tricuspid
valve in the right atrium opening to the right ventricle
pulmonary semilunar valve
valve in the right ventricle leading to the lungs