Chapter 20 - Vocabulary Flashcards
The period of relaxation and repolarization of the atria
Atrial diastole
Return blood to the heart
Veins
The amount of blood pumped by the left ventricle in one minute
Cardiac output
The period between the start of one heartbeat and the beginning of the next
Cardiac cycle
Small blood vessels that collect spent blood from capillary beds and transport it to the larger veins for transport back to the heart
Venules
A lower than normal heart rate
Bradycardia
A faster than normal heart rate
Tachycardia
Carry blood away from the heart
Arteries
The cells that initiate and distribute the stimulus to contract the heart are part of this
Conducting system
The pressure in the wall of the left ventricle during ejection
Afterload
The maximum amount of blood held by the ventricles, which occurs after atrial systole (approximately 130 mL)
End diastolic volume
The ventricles contract and push blood into the pulmonary and aortic trunks (lasts approximately 270 ms)
Ventricular systole
A small branch of an artery leading into capillaries
Arterioles
The network of blood vessels that carries blood to and from the gas exchange surfaces of the lungs
Pulmonary circuit
The period of relaxation and repolarization of the ventricles
Ventricular diastole
The network of blood vessels that carries blood to and from the entire body (not including the lungs)
Systemic circuit
The degree of stretching in ventricular muscles during ventricular diastole
Preload
The atria contract and “top off” the blood volume in the ventricles (lasts approximately 100 ms)
Atrial systole
The ability of cardiac muscle tissue to contract on its own, without neural or hormonal stimulation.
Automaticity
Microscopic thin-walled vessels which interconnect the smallest arteries and the smallest veins. Also called exchange vessels, because their thin walls permit the exchange of nutrients, dissolved gases, and wastes between the blood and surrounding tissues.
Capillaries
The volume of blood pumped from the left ventricle per beat
Stroke volume
