Which statement best describes the importance of the biconcave shape of erythrocytes?
A) It conforms to the molecular shape of hemoglobin.
B) It allows for the movement of erythrocytes out of the capillaries.
C) It makes the erythrocyte small and flexible.
D) It provides a large surface area for the exchange of gases.
E) It allows for phagocytosis of foreign particles.
Ans: D) It provides a large surface area for the exchange of gases.
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The smooth endoplasmic reticulum
a. is most abundant in cells specialized for protein secretion. b. gives rise to transport vesicles containing newly synthesized molecules wrapped in a layer of smooth ER membrane. c. consists of stacks of relatively flattened sacs called cisternae. d. has many ribosomes. e. all of these answers.
What type of epithelium is often found in glands and kidney tubules?
A. Stratified squamous B. Simple squamous C. Pseudostratified columnar D. Simple cuboidal
Melanocytes synthesize melanin, which protects underlying cells from the effects of
ultraviolet light. Indicate whether the statement is true or false
Choose the structures that most directly provide nutrients and remove wastes from osteocytes in compact bone
A) nutrient foramens B) perforating (Volkmann's) canals C) canaliculi D) central canals