1IP summer Anatomy and Physiology II OLCP.
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Free 1IP summer Anatomy and Physiology II OLCP. Questions
Newborns can be protected against certain digestive and respiratory infections when they receive what via their mother's milk? This antibody is also present in secretions like tears and nasal fluid.
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IgD
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IgE
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IgA
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IgM
Explanation
Explanation:
Correct Answer: (C) IgA
IgA is the primary antibody found in breast milk, particularly in colostrum, and provides passive immunity to newborns by protecting the mucosal surfaces of the digestive and respiratory tracts. It is also the main antibody found in other body secretions such as tears, saliva, and nasal fluid, making it well-suited for defending against pathogens at these entry points.
Why Other Options are Incorrect:
A. IgD — This immunoglobulin is primarily found on the surface of B cells, where it functions as a receptor involved in B cell activation, rather than being transferred through breast milk.
B. IgE — This antibody is associated with allergic reactions and defense against parasitic infections, not with passive immunity delivered through breast milk.
D. IgM — This is the first antibody produced during an initial immune response and is too large to be secreted in significant amounts into breast milk or to cross membranes in the way IgA does.
Which chambers of the heart will contain oxygen-rich blood?
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right atrium and left atrium
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right atrium and right ventricle
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left atrium and left ventricle
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left atrium and right ventricle
Explanation
Explanation:
Correct Answer: (C) left atrium and left ventricle
The left atrium receives oxygen-rich blood returning from the lungs via the pulmonary veins, and this oxygenated blood then moves into the left ventricle, which pumps it out to the rest of the body through the aorta. Both of these chambers therefore contain oxygen-rich blood.
Why Other Options are Incorrect:
A. right atrium and left atrium — The right atrium receives deoxygenated blood returning from the body via the superior and inferior vena cava, so it does not contain oxygen-rich blood like the left atrium does.
B. right atrium and right ventricle — Both of these chambers contain deoxygenated blood that is being routed toward the lungs for oxygenation, not oxygen-rich blood.
D. left atrium and right ventricle — While the left atrium contains oxygen-rich blood, the right ventricle contains deoxygenated blood being pumped toward the lungs, so this pairing is incorrect.
Which of the following describes what is occurring with the heart valves when the first heart sound is heard?
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The AV valves are closing.
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The semilunar valves are opening.
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The AV valves are opening.
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The semilunar valves are closing.
Explanation
Explanation:
Correct Answer: (A) The AV valves are closing.
The first heart sound (S1, often described as the "lub") marks the beginning of ventricular systole. As ventricular pressure rises above atrial pressure, the atrioventricular (AV) valves — the mitral and tricuspid valves — snap shut to prevent backflow of blood into the atria. This closure of the AV valves is what produces the first heart sound.
Why Other Options are Incorrect:
B. The semilunar valves are opening. — The semilunar valves (aortic and pulmonic) open just after S1, once ventricular pressure exceeds the pressure in the aorta and pulmonary artery, allowing ejection of blood; their opening does not produce an audible heart sound.
C. The AV valves are opening. — The AV valves open at the end of systole/beginning of diastole to allow ventricular filling, which corresponds to a different point in the cardiac cycle, not the first heart sound.
D. The semilunar valves are closing. — Closure of the semilunar valves produces the second heart sound (S2), marking the end of ventricular systole, not the first heart sound.
Which blood cell functions to transport gases to and from body tissues?
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erythrocyte
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leukocyte
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thrombocyte
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lymphocyte
Explanation
Explanation:
Correct Answer: (A) erythrocyte
Erythrocytes, or red blood cells, contain hemoglobin, which binds to oxygen and carbon dioxide, allowing these cells to transport respiratory gases to and from the body's tissues as part of normal gas exchange.
Why Other Options are Incorrect:
B. leukocyte — Leukocytes, or white blood cells, function in immune defense against pathogens and are not responsible for gas transport.
C. thrombocyte — Thrombocytes, or platelets, are responsible for blood clotting functions, not the transport of respiratory gases.
D. lymphocyte — Lymphocytes are a specific type of white blood cell involved in adaptive immune responses, such as antibody production, and do not transport gases.
Which of the following is a function of capillaries?
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collect excess fluid to transport it back to the heart
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transport blood to the heart
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perform nutrient exchange
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transport blood away from the heart
Explanation
Explanation:
Correct Answer: (C) perform nutrient exchange
Capillaries are the smallest blood vessels with thin, single-cell-layer walls that allow for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues, making nutrient exchange their primary function.
Why Other Options are Incorrect:
A. collect excess fluid to transport it back to the heart — This function is performed by the lymphatic system, not capillaries, which are part of the cardiovascular system.
B. transport blood to the heart — Transporting blood back to the heart is the function of veins and venules, not capillaries.
D. transport blood away from the heart — Transporting blood away from the heart is the function of arteries and arterioles, not capillaries.
Select all statements that are true of vitamin B12.
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Intrinsic factor is required for the body to absorb vitamin B12.
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Hydrochloric acid is required for the body to absorb vitamin B12.
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A deficiency in vitamin B12 can lead to anemia.
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A deficiency in vitamin B12 can lead to leukemia.
Explanation
Vitamin B12 absorption depends on intrinsic factor, a protein secreted by parietal cells in the stomach that binds to B12 and allows it to be absorbed in the ileum of the small intestine. Hydrochloric acid is also necessary because it helps release B12 from dietary proteins so it can bind with intrinsic factor. Because vitamin B12 is essential for red blood cell production, a deficiency can lead to a condition called pernicious anemia.
Why the other options are incorrect:
D. A deficiency in vitamin B12 can lead to leukemia — Leukemia is a cancer of blood-forming tissues and is not caused by a vitamin B12 deficiency; rather, B12 deficiency is linked to anemia, not cancerous cell proliferation.
A patient was found to have a decreased number of basophils. What is a possible outcome of their low basophil count?
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T cells will be unable to directly attack tumors and foreign microorganisms.
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Inflammatory responses in injured and infected tissues will be diminished.
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Bacteria and fungi would not be phagocytized and removed from an infected tissue.
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An increased susceptibility to parasitic infections will occur, as will a decrease in allergic responses.
Explanation
Explanation:
Correct Answer: (B) Inflammatory responses in injured and infected tissues will be diminished.
Basophils release histamine and other chemical mediators that promote inflammation in response to injury or infection. A decreased basophil count would result in a diminished ability to mount an effective inflammatory response in affected tissues.
Why Other Options are Incorrect:
A. T cells will be unable to directly attack tumors and foreign microorganisms. — This function is carried out by cytotoxic T lymphocytes, which are unrelated to basophil activity or count.
C. Bacteria and fungi would not be phagocytized and removed from an infected tissue. — Phagocytosis of bacteria and fungi is primarily performed by neutrophils and macrophages, not basophils.
D. An increased susceptibility to parasitic infections will occur, as will a decrease in allergic responses. — Basophils (along with eosinophils) contribute to defense against parasites and mediate allergic responses; a decrease would actually reduce allergic responses but would be more directly linked to a decreased, not increased, ability to respond to parasites, making this pairing an inconsistent match for the effect of low basophils compared to the diminished inflammatory response.
Which of the following is part of the lower respiratory tract?
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pharynx
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bronchial tree
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larynx
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sinuses
Explanation
Correct Answer: (B) bronchial tree
The bronchial tree, which includes the bronchi and their branching bronchioles, is part of the lower respiratory tract, along with the trachea and lungs. These structures are located below the larynx and are responsible for conducting air deeper into the lungs toward the sites of gas exchange.
Why the other options are incorrect:
A. pharynx — The pharynx is part of the upper respiratory tract, serving as a shared passageway for air and food before it reaches the lower respiratory structures.
C. larynx — The larynx marks the boundary between the upper and lower respiratory tracts but is generally classified as part of the upper respiratory tract.
D. sinuses — The sinuses are air-filled spaces within the skull that are part of the upper respiratory tract, primarily functioning to lighten the skull and add resonance to the voice.
Where does gas exchange occur within the respiratory system?
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In the pharynx
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In the bronchioles
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At the alveoli
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In the larynx
Explanation
Gas exchange occurs at the alveoli, the tiny air sacs at the end of the bronchial tree. Their thin walls and surrounding network of capillaries allow oxygen to diffuse from the air into the blood and carbon dioxide to diffuse from the blood into the air to be exhaled.
Why the other options are incorrect:
A. In the pharynx — The pharynx serves as a passageway for both air and food but does not contain the specialized structures needed for gas exchange.
B. In the bronchioles — The bronchioles function primarily to conduct air toward the alveoli and have walls too thick for efficient gas exchange to occur.
D. In the larynx — The larynx serves as a passageway for air and houses the vocal cords for sound production, but it plays no role in the actual exchange of gases.
If you take a piece of white bread and chew it slowly for a long period of time, the flavor will become very sweet. This is due to the starch molecules in the bread being digested into smaller sugars that trigger a sweet sensation. Which substance is responsible for this breakdown?
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Salivary amylase
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Pepsin
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Bicarbonate ions
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Mucus
Explanation
Explanation:
Correct Answer: (A) Salivary amylase
Salivary amylase is an enzyme secreted by the salivary glands that begins the chemical digestion of starch in the mouth. It breaks down complex starch molecules into smaller sugar units, such as maltose, which produces the increasingly sweet taste noticed when bread is chewed for an extended period.
Why Other Options are Incorrect:
B. Pepsin — This enzyme is active in the stomach and functions to break down proteins, not carbohydrates, so it plays no role in the sweetening of chewed starch.
C. Bicarbonate ions — These ions are secreted by the pancreas to neutralize stomach acid as chyme enters the small intestine; they do not chemically digest starch.
D. Mucus — Mucus serves to lubricate and protect the digestive tract lining, but it has no enzymatic function in breaking down starch molecules.
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