WorksheetsPFT 105 - Midterm Review (Homework 02)
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
The exchange of oxygen and carbon dioxide takes place in tiny saclike structures of the lung called _____.
a)
bronchioles
b)
islets of langerhans
c)
segmental bronchi
d)
alveoli
2.
_____ is the protein constituent of a red blood cell that binds itself with the oxygen inspired through respiration.
a)
Hemoglobin
b)
Cryptochrome
c)
Cytoglobin
d)
Myoglobin
3.
External respiration refers to the process in which the _____.
a)
exchange of carbon dioxide and oxygen takes place between the air in the alveoli and the blood in the pulmonary capillaries
b)
cells of the body take oxygen from the arterial blood and release carbon dioxide into the venous blood
c)
cells of the body oxidize glucose and fatty acids to release energy
d)
diaphragm relaxes to pump carbon dioxide out of the lungs
4.
The ratio between the amount of carbon dioxide expired and the amount of oxygen inspired in one breath best represents the _____.
a)
respiratory exchange ratio
b)
ventilation–perfusion ratio
c)
barometric pressure
d)
intra-alveolar pressure
5.
The tiny blood vessels enveloping each alveolus that facilitate the alveoli exchange of oxygen for carbon dioxide are called _____.
a)
segmental bronchi
b)
terminal bronchi
c)
pulmonary capillaries
d)
external intercostals
6.
The hemoglobin protein that helps in the transportation of oxygen contains four atoms of _____.
a)
iron
b)
copper
c)
zinc
d)
manganese
7.
Identify an accurate statement about the cardiovascular system.
a)
The primary role of the cardiovascular system is to supply oxygen to and remove carbon dioxide from the bloodstream.
b)
The cardiovascular system helps transport oxygenated blood to different tissues in the body.
c)
Regular exercise has a negative impact on the efficiency of the cardiovascular system in pumping blood and supplying oxygen to body tissue.
d)
In the cardiovascular system, oxygenated blood flows from the heart through the venous system and deoxygenated blood returns to the heart through the arterial system.
8.
The fibrous sac that encases the heart is known as the _____.
a)
epicardium
b)
endocardium
c)
myocardium
d)
pericardium
9.
Identify an accurate statement about the structure of the heart.
a)
The walls of the atria of the heart are extremely thick.
b)
The right ventricle of the heart is larger than the left ventricle.
c)
The heart has four chambers: two atria and two ventricles.
d)
The pericardium is the muscular tissue of the heart that is responsible for ventricular contraction.
10.
The blood vessels that transport deoxygenated blood to the heart from the various tissues of the body are known as _____.
a)
capillaries
b)
arteries
c)
veins
d)
precapillary sphincters
11.
The _____ refers to a specialized group of myocardial cells found in the posterior wall of the right atrium that regulates the rate of contraction.
a)
sinoatrial (SA) node
b)
bundle of His
c)
atrioventricular (AV) node
d)
Purkinje fiber
12.
Which of the following statements is true of type I muscle fibers?
a)
They are typically found in the heart.
b)
They have low myoglobin content.
c)
They have a very high mitochondrial density.
d)
They have a very low concentration of oxidative enzymes.
13.
Identify a true statement about maximal aerobic capacity (VO2 max).
a)
VO2 max can be improved through endurance training.
b)
Genetics does not influence an individual’s VO2 max.
c)
VO2 max is typically measured as the maximum amount of carbon dioxide consumed during an aerobic endurance test.
d)
The higher the value of VO2 max, the lower the capacity to deliver more oxygen per unit of time.
14.
Which of the following effects is endurance training most likely to have on the bodies of athletes?
a)
It will increase the number of capillaries to allow for more blood flow.
b)
It will decrease the distribution and flow of blood to the different muscles in the body.
c)
It will increase the viscosity of blood.
d)
It will reduce the turnover rate of red blood cells.
15.
The flow of blood to the active tissues in the body increases with a decrease in _____.
a)
temperature
b)
the concentration of potassium ions
c)
the level of oxygen
d)
the concentration of hydrogen ions
100 %
