The cardiorespiratory system Flashcards
Cardiac cycle
The sequence of events in one beat of the heart
What is a normal resting heart rate?
60-90 bpm
cardiac hypertrophy
the muscular walls of the left ventricle can sometimes increase in size
stroke volume
the amount of blood pumped out of the ventricle per min
Cardiac output
the amount of blood pumped out by the ventricles in 1 min
stroke volume x heart rate
blood pressure
the amount go pressure that is exerted on the walls of the blood vessels as blood moves through them
typical blood pressure
120/80mmHg
What does the first and second number in blood pressure represent
the first number represents the highest level blood pressure reaches when the heart contracts
the second number represents the lowest level blood pressure
arteries
carry blood away from the heart to capillaries
veins
carry blood under low pressure from capillaries back to the heart
venous return
amount of blood returned to the heart by the veins
capillaries
carry blood from arterioles to venues
diffusion
movement of molecules from an area of greater concentration to an area of lesser concentration
gaseous exchange
diffusion that occurs in the exchange of gases within the lungs
pulmonary circulation
the flow of blood from the right side of the heart to the lungs and then back to the left side of the heart
