circ ulatory system
Which type of cell carries oxygen around the body?
red blood cells
What does the pulmonary vein supply the heart with?
supplies the heart with oxygenated blood from the lungs.
Which of these is NOT a function of blood?
the digestion of nutrients
which vessels carry blood to the heart
veins
Systolic blood pressure is measured when ...
ventricles contract
Systolic pressure measures which of the following?
ventricular contraction
Which of the following blood types may be referred to as the universal donor?
O-
Which heart valves are NOT actively closed by the contraction of muscular structures?
Semilunar valves
What is it called when plaque builds up in the arteries?
atherosclerosis
Arteries
away from the heart
What shape are red blood cells?
biconcave disks.
Which vessels supply the heart with blood?
coronary arteries
The average blood pressure is
120/80
The average human heart beats ...
72 bpm
Rank the following blood vessels in order of their average pressure, from highest to lowest: artery, vein, arteriole, venule, aorta, capillary.
Aorta > artery > arteriole > capillary > venule > vein
In terms of being open or closed, what is the state of the mitral and tricuspid valves (left and right atrioventricular valves, respectively) at the end of the first heart sound?
Both are closed
What layer of the heart would be most immediately susceptible to infections caused by bacteria circulating in the blood?
Endocardium
What physical feature of large systemic arteries (resistance vessels) makes them relatively more responsive to changes in intracellular calcium concentrations?
Thick tunica media
How can the circulatory system promote heat retention/conservation, such as on a cold day?
Vasoconstriction
what is a net work of capillaries called?
a capillary bed
A blood clot in the brain can cause which event?
a stroke
At the instant following the second heart sound, which heart valves are open?
alll valves are closed
Which type of vessel needs to withstand high blood pressure?
an artery
A low red blood cell count or a reduced amount of hemoglobin is called _____.
anemia
which vessels carry blood away from the heart
arteries
What is a thrombus?
blood clot
What are tube-like structures that include the arteries, arterioles, capillaries, venules, and veins?
blood vessels
what is leukemia
cancer of blood cell producing tissue
veins
carry blood to the heart
what creates the "lub dub" heart sounds
closing of valves
lower number of pressure
distolic
What kind of signal does the cardiac pacemaker use?
electrical
Which of the following is NOT transported in plasma?
electrolytes & urea are and bile isnt
Which of the following is a possible result of improper blood flow in a coronary artery?
heart attack
Which of the following compounds transport oxygen in the blood?
hemoglobin
which side of the heart pumps oxygenated blood
left side
In what units is blood pressure measured?
mm/Hg
how thick is the wall of the capillary
one cell
The heart is enclosed in a double-walled sac called the ...
pericardium
Which component of blood is crucial to clotting?
platelets
what promotes blood clotting
platelets
______ circulation takes blood from the heart to the lungs and back.
pulmonary
Which of these vessels carries deoxygenated blood from the heart?
pulmonary artery
What heart chamber does the vena cava empty into?
right atrium
Which part of the heart pumps deoxygenated (oxygen-poor) blood?
right side
The rate at which the heart contracts depends on the ...
sinoatrial node.
higher number in blood pressure
systolic pressure
What does the pulse represent?
the heartbeat
What is plasma?
the liquid component of blood
What is the function of white blood cells?
to be part of the immune system.
What is the function of a valve in a vein?
to prevent reverse blood flow
What is the function of the blood-brain barrier?
to protect the brain from toxins
Why is blood clotting essential?
to reduce blood loss.
The pulmonary arteries carry blood ...
to the lungs
Where does the right ventricle pump blood to?
to the lungs
Why do arteries have thick walls of smooth muscle?
to withstand high pressure
Which type of vessel contains valves?
veins
what is the primary component of blood by volume
water
