Ovaries secrete estrogen
Indicate whether the statement is true or false.
TRUE
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What is the basic difference between simple diffusion and facilitated diffusion across a cell membrane?
A) In simple diffusion, molecules move down the concentration gradient but in facilitated diffusion molecules move up the concentration gradient. B) In facilitated diffusion, molecules only move with the aid of a protein in the membrane. C) Simple diffusion requires molecules to move through special doorways in the cell membrane. D) Simple diffusion is passive but facilitated diffusion is an active process that uses energy.
Which statement regarding the cornea is not true?
A. The cornea lacks blood vessels (it is avascular). B. The cornea lacks nerves (it is aneural). C. The internal corneal epithelium obtains oxygen from fluid in the anterior chamber of the eye. D. The external corneal epithelium receives nourishment from lacrimal gland secretions. E. The cornea serves to refract light rays.
Which of the following is least related to glucose uptake by different cells in the body?
a. receptor-mediated endocytosis b. facilitated diffusion c. carrier-mediated transport d. secondary active transport e. cotransport
What is the largest of the cranial nerves and the most important sensory nerve of the face?
A. Trigeminal nerve (V) B. Facial nerve (VII) C. Abducens nerve (VI) D. Accessory nerve (XI) E. Hypoglossal nerve (XII)