What is an example of mechanical digestion?
Mastication
Absorption
Catabolism
Anabolism
The Correct Answer is A
A. Mastication: Mechanical digestion involves physically breaking down food into smaller pieces, and mastication is a prime example of this.
B. Absorption: This is the process by which nutrients pass from the digestive system into the bloodstream, not a form of mechanical digestion.
C. Catabolism: Catabolism refers to chemical processes that break down molecules within the body, not mechanical digestion.
D. Anabolism: This refers to the synthesis of complex molecules from simpler ones, not related to the physical breakdown of food.
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Related Questions
Correct Answer is A
Explanation
A. It decreases the heart rate.: Acetylcholine is a neurotransmitter that binds to receptors in the heart, leading to a decrease in heart rate by activating the parasympathetic nervous system.
B. It increases the heart rate.: Acetylcholine does not increase heart rate; that function is primarily associated with norepinephrine, which is part of the sympathetic nervous system.
C. It increases the rate of spontaneous depolarization: Acetylcholine actually decreases the rate of spontaneous depolarization in pacemaker cells of the heart, leading to a slower heart rate.
D. It shortens the time for repolarization.: Acetylcholine does not shorten repolarization; it increases the duration of repolarization due to the hyperpolarizing effects on the heart cells.
Correct Answer is C
Explanation
A. Prostate: The prostate gland produces seminal fluid that nourishes and transports sperm but does not store mature sperm. Its main function is to contribute to the formation of semen.
B. Seminal Vesicle: The seminal vesicles produce a significant portion of the seminal fluid but do not store sperm. Instead, they provide nutrients for sperm and help form semen.
C. Epididymis: The epididymis is a coiled tube located at the back of each testis where sperm mature and are stored until ejaculation. It plays a crucial role in the maturation process of sperm.
D. Bulbourethral: The bulbourethral glands (or Cowper's glands) secrete a pre-ejaculate fluid that lubricates the urethra but do not store sperm.
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