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Terms in this set (53)
Breathing functions to?
deliver oxygen to cells, where it takes part in the reactions of cellular respiration that liberate energy from nutrient molecules and get rid of carbon dioxide, which maintains the pH of the internal environment.
The vocal cords are in the _____?
Which of the following is not a function of the mucus-covered nasal passages?
Cooling exhaled air
The pharynx functions as a ______, whereas the larynx functions as a ______.
common passageway for air and food; passageway for air only
The trachea ________?
all of the above are correct
The right lung has ______ lobes; the left lung has ______ lobes.
superior, middle, and inferior; superior and inferior
The force responsible for normal expiration is supplied by the _________?
elastic recoil of tissues and surface tension
The volume of air that enters the lungs during forced maximal inspiration is the ______?
inspiratory reserve volume
Of the respiratory air volumes listed, which one has the largest volume?
The volume of air that enters (or leaves) during a single respiratory cycle is the _____?
The first event in inspiration is ____?
the diaphragm moves downward and the external intercostal muscles contract
The first event in expiration is _____?
the diaphragm and external intercostal respiratory muscles relax
The inverse relationship between pressure and volume is known as _____?
The respiratory control areas are in the ____?
pons and medulla oblongata
Which of the following is important in maintaining the pH of blood?
The chemoreceptors in the carotid and aortic bodies are most sensitive to changes in blood concentration of?
Why would carbon dioxide sometimes be added to the air that a patient breathes?
To increase the rate and depth of breathing.
Hyperventilation is usually accompanied by a(n) ____?
decrease in blood CO2 concentration and a rise in pH
The walls of the alveoli are composed of _____?
simple squamous epithelium
The amount of oxygen released from oxyhemoglobin increases when ____?
carbon dioxide concentration increases
Circulation is vital because it _____?
supplies oxygen and nutrients to and removes wastes from tissues
The pulmonary circuit ____?
sends oxygen-poor blood to the lungs
The systemic circuit _____?
sends oxygen-rich blood to the tissues
When the ventricular walls contract, ________.
the mitral and tricuspid valves close
Which of the following is the correct sequence of parts through which blood moves from the vena cava to the lungs?
Right atrium, tricuspid valve, right ventricle, pulmonary valve
The right atrium receives blood directly from _____?
the superior vena cava, inferior vena cava, and coronary sinus
Atrial natriuretic peptide is a hormone that _____?
all of the above
The pain of angina pectoris comes from a blockage in an artery that supplies the _____?
Blood flow to the right side of the heart muscle decreases due to constriction of the _____, and decreased blood flow to the heart tissue can result in _____.
right coronary artery; ischemia
permits one—way blood flow from the left atrium to the left ventricle
permits one-way blood flow from the right atria to the right ventricle
permits one—way blood flow from the right ventricle to the pulmonary trunk
permits one—way blood flow from the left ventricle to the aorta
depolarization of atria
repolarization of ventricles
depolarization of ventricles
What is the correct sequence of parts that carry cardiac impulses?
Impulses that the vagus nerve carries to the heart ____?
are parasympathetic and decrease heart rate
The normal pacemaker of the heart is the ____?
The effect on the heart of excess potassium ion concentration usually is _____?
decreased rate and decreased force of contraction
Once cells in the SA node reach threshold, _________.
an action potential is triggered
Because net inward pressure in the venular ends of capillaries is less than net outward pressure in the arteriolar ends of capillaries, _____________?
more fluid leaves the capillaries than returns
Water and dissolved substances leave the arteriole end of a capillary due to ____, and enter the venule end of a capillary due to ______.
hydrostatic pressure being higher than osmotic pressure; osmotic pressure being higher than hydrostatic pressure
The longest vein in the body is the _____?
great saphenous vein
Which of the following helps return blood to the heart?
Contracting skeletal muscles
Pulse pressure is calculated by ________?
subtracting diastolic pressure from systolic pressure
In the arterial disease atherosclerosis, _________.
all of the above may happen
The left side of the heart pumps blood through a lower resistance so it needs more muscle mass.
Which of the following is not one of the three main factors that influence blood pressure?
Vasodilatation is a widening of the lumen of a blood vessel.
Systemic arterial systolic pressure is most closely associated with __________.
Left ventricular contraction
What term refers to the inner lining of the heart?
What term refers to an abnormally slow heart rate?
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