Of the factors that influence diffusion of respiratory gases, the most variable and, therefore, important factor to consider is the
A) concentration gradient.
B) membrane surface area.
C) diffusion distance.
D) electrical charge.
E) membrane thickness.
A) concentration gradient.
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The process of cell division that divides the cytoplasm of the zygote among blastomeres is called
A) cleavage. B) implantation. C) placentation. D) embryogenesis. E) blastulation.
Lymphocytes are involved in specific immune reactions.
Answer the following statement true (T) or false (F)
Why are eyelashes shorter than terminal hairs on the scalp?
A) The growth stage of an eyelash is shorter. B) The vascular supply of the eyebrow follicle is much less than that of the hair follicle on the scalp. C) Hormones in the eyebrow follicle turn off growth after it has reached a predetermined length. D) Eyelashes grow slower than terminal hairs.
The tube that carries urine out of the body is called the ________.
A. urethra B. collecting tube C. trigone D. ureter