Which structure contains enzymes needed by a sperm cell to penetrate an oocyte?
A. Sustentacular cells
B. Androgen-binding protein
C. Gubernaculum
D. Acrosome
Answer: D
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A stem cell divides to give rise to two differentiated cells.
Answer the following statement true (T) or false (F)
A pebble kicked up into a shoe causes the ________ of localized deep pressure, but the ________ of it is an awareness of discomfort.
Fill in the blank(s) with the appropriate word(s).
The viscosity of blood is due more to the presence of __________ than to any other factor.
A. fibrin B. albumin C. sodium D. erythrocytes E. nitrogenous wastes
Answer the following statements true (T) or false (F)
1) The lacuna contains osteoblasts and osteoclasts. 2) The central canals connect the lacunae to one another. 3) Articular cartilage covers opposing bone surfaces at joints. 4) The diaphysis is the region at each end of a long bone. 5) Periosteum lines the marrow cavity.