Simple diffusion is best described as substances __________.
A)moving actively against a concentration gradient
B)moving passively against a concentration gradient
C)moving passively down a concentration gradient
D)moving actively down a concentration gradient
C)moving passively down a concentration gradient
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Nurse cells secrete inhibin, which regulates the rate of sperm production.
Answer the following statement true (T) or false (F)
The diagram illustrates accessory structures of the skin. What does "D" represent?
A. Hair follicle B. Duct of eccrine sweat gland C. Sweat pore D. Eccrine sweat gland E. Sebaceous gland
Which three bones fuse to make up the hip bone?
A) ischium, ilium, and pubis B) ilium, sacrum, and coccyx C) sacrum, coccyx, and pubis D) ischium, ilium, and acetabulum E) ilium, pelvis, and acetabulum
The first body cavity is called the ________
A) somite B) amniotic cavity C) chorion D) yolk sac E) coelom