A couple interested in conceiving has been carefully charting her menstrual cycles for many months. Relative to ovulation, what window of time does coitus need to occur in order to achieve fertilization?
What will be an ideal response
The oocyte is viable for 12 to 24 hours after it is cast out of the ovary. Most sperm retain their fertilizing power for 24 to 48 hours after ejaculation. Consequently, for successful fertilization to occur, coitus must occur no more than two days before ovulation and no later than 24 hours after.
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Which of the following is not an anatomical component of a synovial joint?
A. Articular cartilage B. Joint cavity C. Interosseous membrane D. Fibrous capsule E. Synovial membrane
Pulmonary arteries are shorter and wider than systemic arteries. Accordingly, pulmonary circuit blood pressure is:
A. high and blood flows very rapidly through pulmonary capillaries, maximizing gas exchange. B. high and blood flows very slowly through pulmonary capillaries, maximizing gas exchange. C. low and blood flows very rapidly through pulmonary capillaries, maximizing gas exchange. D. low and blood flows very slowly through pulmonary capillaries, maximizing gas exchange.
Which of the following is the monomeric, building block of nucleic acids?
a. ribose b. phosphate c. nitrogenous base (A, G, C, T, U) d. nucleotide e. amino acid
If five action potentials arrive at the same synapse in very close succession, which of the following would occur?
A. The direction of the action potential is reversed. B. Temporal summation occurs. C. Spatial summation occurs. D. Hyperpolarization occurs. E. Depolarization always occurs.