Digestive juices in the lumen of the intestine move across which surface of the epithelial cells there?
A. Intracellular surface
B. Basal surface
C. Laminar surface
D. Apical surface
Answer: D
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Which hormone is necessary for the growth of endometrial glands which are important for the sustenance of a growing embryo until its implantation?
A) luteinizing hormone (LH) B) testosterone C) progesterone D) inhibin E) follicle-stimulating hormone (FSH)
The middle layer of the heart wall that is made of cardiac muscle tissue is the ________.
Fill in the blank(s) with the appropriate word(s).
Where is the left vagus (X) nerve in the diagram?
a) A b) C c) D d) F e) G
During spermatogenesis, one spermatogonium containing
a. 46 chromosomes yields 16 spermatozoa, each containing 23 chromosomes. b. 46 chromosomes yields 1 spermatozoon containing 23 chromosomes and a polar body containing the other 23 chromosomes. c. 46 chromosomes yields 2 spermatozoa, each containing 23 chromosomes. d. 46 chromosomes yields 1 spermatozoon containing 46 chromosomes. e. 23 chromosomes yields 1 spermatozoon containing 23 chromosomes.