What are the major chemical buffer systems of the body?
The bicarbonate, phosphate, and protein
The urinary and digestive
The bicarbonate, nucleic acids, and protein
The urinary and respiratory
The Correct Answer is A
A. The bicarbonate, phosphate, and protein: The major chemical buffer systems in the body are the bicarbonate buffer system, the phosphate buffer system, and the protein buffer system. These buffers help maintain pH balance in the blood and other fluids.
B. The urinary and digestive: The urinary and digestive systems are involved in excretion and digestion, not buffering.
C. The bicarbonate, nucleic acids, and protein: Nucleic acids are not major buffering systems in the body; the bicarbonate, phosphate, and protein systems are the primary ones.
D. The urinary and respiratory systems play roles in regulating acid-base balance through excretion and gas exchange but are not chemical buffer systems themselves.
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Correct Answer is A
Explanation
A. High HDL: low LDL- High-density lipoprotein (HDL) is known as "good cholesterol" because it helps remove cholesterol from the arteries. Low-density lipoprotein (LDL) is known as "bad cholesterol" because it can lead to plaque buildup in arteries. A high HDL to low LDL ratio is considered healthy as it is associated with a lower risk of cardiovascular disease.
B. High LDL: low chylomicron- High levels of LDL are unhealthy as they increase the risk of plaque formation in arteries, which can lead to cardiovascular diseases. Chylomicrons are lipoproteins that transport triglycerides and cholesterol from the intestines to other parts of the body.
C. High SFA: low HDL- Saturated fatty acids (SFA) can raise LDL levels and lower HDL levels, leading to an unhealthy lipid profile and increased risk of heart disease.
D. High LDL: low HDL- High LDL and low HDL is an unhealthy combination because it increases the risk of cardiovascular disease due to higher potential for plaque buildup in the arteries.
Correct Answer is D
Explanation
A. ADH (antidiuretic hormone) promotes water retention by increasing water reabsorption in the kidneys. Estrogen does not mimic the action of ADH.
B. Natriuretic peptide promote sodium excretion, which leads to water loss, not retention. Estrogen does not mimic this action.
C. Oxytocin is primarily involved in labor and lactation, not water retention. Estrogen does not mimic oxytocin's effects.
D. Aldosterone promotes sodium and water retention by increasing sodium reabsorption in the kidneys. Estrogen can mimic the action of aldosterone, leading to water retention during certain phases of the menstrual cycle.