Card Set Information
Chapter 5 AP&T
instrument to measure pressure
Two parts of the circulatory system are...
pulmonary & systemic circulation
transports deoxygenated blood
carries oxygenated blood.
inner layer of the heart lining the heart chambers.
smooth, thin layer serves to reduce friction as blood passes through heart chambers.
thick muscular middle layer of heart.
contractions develop pressure to pump blood through blood vessels.
double-outer-layered plueral sac.
: inner layer of sac
: outer layer of sac
four valves of the heart
tricuspid, pulmonary, mitral(bicuspid) & aortic valve
controls opening between the right atrium & right ventricle
prevents blood ejected into pulmonary artery from returning to right ventricles as it relaxes.
mitral (bicuspid) valve=
blood flows through this atroventricular valve to the left ventricle and can't go back up the left atrium.
blood leaves left ventricle through this valve and can't return to the left ventricle.
The heart rate is regulated by the..
autonomic nervous system
electrical impulses begin where?
the sinoatrial node (SA), or pacemaker.
the channel within blood vessels through which blood flows.
smallest of the arteries, which deliver blood to capillaries.
are very thin walled & a network of tiny blood vessels or capillary bed.
carry blood back to the heart.
are small veins & blood leaving capillaries first enter these to then merge into larger veins.
blood pressure (BP)=
a measurement of the force exerted by blood against the wall of a blood vessel.
highest blood pressure reading
lowest blood reading pressure