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 C
Explanation
A. Ingestion refers to the process of taking in food through the mouth, not the absorption of nutrients into the body's tissues.
B. Digestion involves the breakdown of food into smaller molecules that can be absorbed, but it does not refer to the actual uptake of these nutrients into tissues.
C. Absorption is the process of taking up nutrient molecules into the bloodstream from the digestive tract, which then allows them to be used by the body's tissues.
D. Compaction refers to the process of absorbing water and consolidating indigestible residues into feces, not the absorption of nutrients into tissues.
Correct Answer is E
Explanation
A. Urethra: The urethra is a part of the urinary system that carries urine from the urinary bladder to the outside of the body.
B. Ureter: The ureters are tubes that carry urine from the kidneys to the urinary bladder. They are part of the urinary system.
C. Kidney: The kidneys are the primary organs of the urinary system responsible for filtering blood and producing urine.
D. Urinary bladder: The urinary bladder is an organ in the urinary system that stores urine before it is excreted.
E. Liver: The liver is not an organ of the urinary system. It plays a crucial role in metabolism, detoxification, and bile production, but it is part of the digestive system.