Circulatory System Flashcards
how many heart chambers do alligators and crocodiles have?
4
how many chambers do most reptiles have?
3
def: connects right atria/ventricle
tricuspid valve
def: connects left atria/ventricle
bicuspid valve
def: connects right ventricle and pulmonary artery
pulmonary semilunar valve
def: connects left ventricle to aorta
aortic semilunar valve
what are the steps of the cardiac cycle?
- heart at rest, waiting for AP
- SA node in upper right atrium initiates contraction of atria and stimulates AV node
- AV node passes impulse to Bundle of His between ventricles
- Bundle of His passes single to Purkinje fibers = contraction of both ventricles
def: contraction of atria/ventricles
systole
def: relaxation of atria/ventricles
diastole
def: antibodies attack blood cells with foreign antigens, forming clumps
agglutination
what is the universal recipient blood type?
AB+
what is the universal donor blood type?
O-
def: carry oxygenated blood away from the heart
arteries
def: carry oxygenated blood towards the heart
veins
def: smallest vessels with a single layer of endothelial cells to allow for exchange of gas, nutrients, and waste with body tissues
capillaries
