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. Small intestine is the primary site of nutrient absorption. The majority of digestion and absorption of nutrients such as carbohydrates, proteins, and fats occurs in the small intestine, particularly in the duodenum and jejunum.
B. Pancreas secretes digestive enzymes into the small intestine but does not absorb nutrients itself.
C. Stomach plays a role in the digestion of proteins and the mechanical breakdown of food, but it absorbs very few nutrients, primarily alcohol and some drugs.
D. Large intestine absorbs water and electrolytes, but it is not the major site of nutrient absorption. Most nutrients are absorbed before food reaches the large intestine.
Correct Answer is A
Explanation
A. Uterine tube: Fertilization typically occurs in the uterine tube (also known as the fallopian tube). The sperm travels from the cervix through the uterus and into the uterine tube, where it meets and fertilizes the egg.
B. Uterus: The uterus is where the fertilized egg implants and develops into a fetus, but it is not where fertilization occurs.
C. Ovary: The ovary is where eggs are produced and released during ovulation, but fertilization does not occur here.
D. Urinary bladder: The urinary bladder is part of the urinary system, not the reproductive system, and has no role in fertilization.