the heart and blood vessels Flashcards
why does the septum separates the two sides o the human heart
to prevent oxygenated blood and deoxygenated blood from mixing
describe one difference between the walls of the right and left ventricle
the walls of the left ventricle were thicker than the walls of the right
which vein carries blood richest in oxygen
pulmonary vein
which vein carries blood between the intestine and the liver
aorta
which vein carries blood lowest in metabolic waste
renal vein
which vein carries blood into the right atrium of the heart
vena cava
give a detailed account of the heart cycle, to include the functions of the sa node and the av node
sa node sneds an impulse to the aorta
av node sends an impulse to the ventricles
atria contracts, bicuspid anf tricuspid valves open, blood is pumped to the ventricles
name the period of the heart cycle when the cardiac muscle of the heart is contracting, non contracting
contracting - systole
non contracting - diastole
explain how the ventricles are contracting
semilunar valves are open
state th location of the SA node in the heart
wall of right atrium
name the circuit to which the right ventricle pumps blood
pulmonary
name the circuit to which the left ventricle pumps blood
systemic
each heartbeat creates two audible sounds, what causes these sounds
valves closing
what is the function of the coronary artery
to supply heart muscle with blood
describe the effect on the cicurlatory system of smoking
increase heart rate
why is the blood in the right side of the heart kept separate from blood in the left
the blood in the right is deoxygenated, the blood in the left is oxygenated
what is meant by the term diastole
when heart chambers relax
how did you identify the right hand side from the left hand side of the heart
the left ventricle side has a thicker cardiac muscle than the right side
on which surface of the heart did you observe the coronary artery
top front surface
describe how you dissected the heart to identify the bicuspid valve
we disinfected our scalpel and put on our lab coats, we placed the heart on our lab coats, we placed the heart on our dissecting board and identified the top and bottom surface, we carefully cut the left ventricle open with a scalpel to identify our bicuspid valve
state the precise location of one semilunar valve and describe how you further dissected the heart to locate this valve
the semi lunar valve was located at the base of the aorta, we cut into the aorta
the sounds created during the cardiac cycle
caused by valves closing, tricuspid and bicuspid valve close
state the precise location and describe the role of the SA node
causes the ventricles, atria and valves to contract (systole) SA node is located in the wall of the right atriums
state the precise location and describe the role of AV node
AV sends regular electrical impulses down the septum, the AV node is located in the septum
what exactly is being measured when a persons blood pressure is taken
force of blood against wall go the artery
