Which of the following correctly describes an erection?
A. The spongy tissue in the penis fills with air.
B. Smooth muscles of vascular spaces in the penis contract.
C. Parasympathetic impulses constrict arteries leading to the penis.
D. Parasympathetic neurons release nitric oxide causing dilation of small arteries in the penis.
Answer: D
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The following image depicts a physician palpating the:
A) fundus of the stomach. B) pancreas. C) inferior margin of the liver. D) costodiaphragmatic recess. E) transverse colon.
Which statement is incorrect?
a. One primary spermatocyte or one primary oocyte containing 46 chromosomes respectively yields two spermatozoa or two ova, each containing 23 chromosomes. b. There is a continual supply of spermatogonia through mitotic activity. c. The first meiotic division involved in oogenesis is completed just prior to ovulation. d. It may take about 11 to 50 years for the process of oogenesis to be completed. e. During oogenesis, there is unequal distribution of cytoplasm resulting in the production of polar bodies that disintegrate.
Once formed inside of the cell, most endocytic vesicles will fuse with which organelle for sorting?
A. endoplasmic reticulum B. Golgi apparatus C. endosome D. nucleus E. mitochondria
The rubbery matrix of cartilage is secreted by ________, whereas ________ produce the fibers and ground substance that form the matrix of fibrous connective tissue
A) mast cells; fibroblasts B) adipocytes; plasma cells C) osteocytes; chondroblasts D) chondroblasts; plasma cells E) chondroblasts; fibroblasts