Flashcards in Chapter 15 Physiology of Cardiovascular System Deck (19):
long, soft sound made when AV close
short, loud sound made when SV close
abnormal swishing sound, occurs when valves don't close completely and blood leaks into chamber.
the pressure blood exerts on its containing vessels.
blood exits heart, contraction
blood enters heart, relaxation
pressure generated by blood exiting the heart
pressure generated by blood entering the heart 70-90 mmHg
high blood pressure
stroke volume x heart rate
end diastolic volume + end systolic volume
breathing, heart sounds, pulse, blood pressure
Effect of Exercise of Heart
increases HR, blood pumping faster; using oxygen more quickly, must pump oxygen to body faster and more frequently.
Effect of Cold Stimulus on Heart
HR increases in cold temperatures because it must pump faster to maintain core temperature. Needs to ensure blood gets to heart and other vital organs; during hypothermia body will stop pumping blood to extremities and only pump to vital organs (survival mode)
atrial depolarization, represents the immediate excitation that follows atrial contraction.
ventricular depolarization, electrical activity that immediately proceeds ventricular depolarization with atrial depolarization (hidden by ventricular depolarization)
Repolarization of ventricles.
depresssed S-T segment= heart attack
abnormally long QRS Complex= muscle fibers are not receiving electrical signal which could alter contraction of ventricles.