In the dark, the Na+ channels in the outer segments of rod cells are
A. open.
B. closed.
C. primarily affected by inhibitory neurotransmitter input.
D. important in making the cell hyperpolarized in this resting state.
A. open.
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Which types of cells in the human body do not repair themselves if they have been damaged?
a. Skin b. Bone c. Blood d. Hair e. Nerve
The rapid mitotic division of the zygote as it moves along the oviduct on its way to the uterus, becoming a pre-embryo. _____
A) Human chorionic gonadotropin
B) Zygote
C) Chorion
D) Morula
E) Folic acid
F) Fertilization
G) Blastocyst
H) Parturition
I) Cleavage
J) Ovulation
K) Placenta
L) Implantation
Innate immunity is
a. the body's first line of defense. b. the body's second line of defense. c. the body's third line of defense. d. involved with the production of antibodies. e. associated with all of these
All microorganisms are parasites.
Answer the following statement true (T) or false (F)