Already Passed Answers 2025-2026
Edition.
During cellular respiration, ____ and _____ are produced - Answer CO2 and H2O
Function of the circulatory system - Answer -Deliver oxygen, nutrients, and other substances
(such as hormones) to the cells.
-Remove waste products of cellular metabolism
Removal of waste products by cellular metabolism - Answer -CO2 is blown off by the lungs
-Waste products are removed
by the kidney and GI tract
-Some waste products are
neutralized by the liver before being removed by the kidney and GI tract
The structure that achieves this function is the cardio-vascular system which is composed of: -
Answer 1. A pump (heart)
2. Pipes (blood vessels)
The heart beats to______________ - Answer pump blood into the vessels
Heart beat depends on____________ - Answer transmission of electrical impulses that cause
the heart muscle to contract
The heart has ___ chambers - Answer 4
The two Atria - Answer Superior right & left chambers
Atria receive blood from the _____ and pushes blood into the ________ - Answer veins,
ventricles
,Ventricles receive blood from the _____ and pushes blood into the ________ - Answer atria,
arteries
As a chamber relaxes, it _________ and ___________ with blood - Answer dilates, fills
the ________ dilate first - Answer atria
heart cycle - Answer a synchronized and cyclic relaxation and contraction of the heart
SA node - Answer located in the R atrium and is the pacemaker (generator of heart rhythm)
AV Node - Answer coordinates the atria and ventricles
ECG records the ________ activity of the heart with its corresponding ________ - Answer
electrical, waves
P wave - Answer atrial depolarization
depolarization - Answer Contraction
repolarization - Answer relaxation
QRS complex - Answer depolarization of the ventricles
T wave - Answer repolarization of the ventricles
hidden by QRS complex - Answer repolarization of atria
__________ is performed by the blood vessels - Answer circulation
Three types of blood vessels - Answer 1. arteries
2. capillaries
,capillaries - Answer connect the arteries and veins
veins - Answer carry blood towards the heart
Pulmonary circulation goes to the _______ though the __________ side of the heart - Answer
lungs, right
Systemic circulation occurs through the _______ heart - Answer left
in pulmonary capillaries the blood becomes _________ - Answer oxygenated
Hb in pulmonary capillaries - Answer Hemoglobin (Hb) in erythrocytes
(RBC) binds to oxygen (O2) in the lungs where O2 concentration is high
in systemic capillaries, the blood becomes _________ - Answer unoxygenated
Hb releases O2 in the tissue where O2 conc is low in __________ capillaries - Answer systemic
in systemic circulation, _________ carry _________ blood - Answer arteries, oxygenated
in systemic circulation, _________ carry _________ blood - Answer veins, unoxygenated
in pulmonary circulation, ________ carry ________ blood - Answer arteries, unoxygenated
in pulmonary circulation, ________ carry ________ blood - Answer veins, oxygenated
blood flow through the heart - Answer SVC --> Rt atria --> Tricuspid --> Rt ventricle -->
Pulmonic valve --> Lungs --> Lt atria --> Mitral valve --> Lt ventricle --> aortic valve --> aorta -->
Body
in systemic circulation, ________ carry blood _______ the heart - Answer arteries, from
, ________ carry blood back to the heart - Answer veins
_________ circulation is part of systemic circulation - Answer coronary
in pulmonary circulation, ________ carry _________ blood from the _________ ventricle -
Answer arteries, unoxygenated, right
in pulmonary capillaries, ______ is released into the lungs and ____ is absorbed into the blood -
Answer CO2, O2
pulmonary _______ carry the oxygenated blood to the _____ atrium of the heart - Answer
veins, left
the walls of the arteries and veins are composed of three layers; from innermost to
outermost________ - Answer INNER
tunica intima
tunica media
tunica adventitia
OUTER
tunica intima - Answer endothelial cells; smooth, thin layer
tunica media - Answer smooth muscle
thickest layer
tunica adventitia - Answer (externa) connective tissue
capillary walls have only a layer of ____________ cells - Answer endothelial
an elastic structure that supports the overlying endothelial cells is called the ____________ -
Answer basement membrane
the basement is located: - Answer peripheral to the tunica intima