lec 9 circulation Flashcards
review NOT A FLASHCARD
-heart animation
need to know? NOT A FLASHCARD
-cells lie within 0.03 mm of blood vessels
-capillaries provide extremely large surface area for exchange
-neutrophil?
a humans internal transport system is the..?
circulatory system
the circulatory system is composed of…?
a muscular heart that circulates blood thru blood vessels
which blood vessel carries blood away from the heart, to the rest of the body?
thick-walled arteries
what do tiny capillaries do?
allow exchange of materials b/w blood and surrounding tissue
which blood vessel collects blood from the body to bring it back to the heart?
thick-walled veins
our circulatory system is a closed system, what does this mean?
blood never leaves the blood vessels
what are the 4 chambers of the human heart?
right atrium, right ventricle, left atrium, left ventricle
explain the role of each chamber within the heart
right atrium:
-receives blood from body
-pumps blood to right ventricle
right ventricle:
-pumps blood to lungs
left atrium:
-receives blood from lungs
-pumps blood to left ventricle
left ventricle:
-pumps blood thru body
t/f heart valves open both ways
false, valves open one way
the sound of heartbeat results from..?
closing of the valves
how is the sound of a heartbeat described? explain where each of the sounds comes from
lub-dub sound
lub: valve b/w atrium and ventricle shuts
dub: vavle b/w ventricle and arteries shuts
what does blood pressure represent?
pressure change in arteries that receive blood from left ventricle
how is blood pressure represented?
120/80
first #: pressure generated from contraction of left ventricle
second#: pressure when ventricle relaxes+refills
