Voluntary responses of the body to internal or external environmental changes are automatic (not under our conscious control).
Answer the following statement true (T) or false (F)
False
You might also like to view...
Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours. This enhanced ability of the sperm to fertilize the ovum is called capacitation. In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum. These observations suggest that
A) pH is an important factor in the process of capacitation. B) in capacitation, secretions of the female reproductive tract are taken up by the sperm. C) only sperm that come into contact with vaginal secretions are capable of fertilizing an ovum. D) capacitation is temperature-dependent. E) capacitation involves the removal of some inhibiting substance(s) from the sperm.
The role of a(n) ________________________________________, which is the shell of a cuttlefish, is to wear down a bird's beak
Fill in the blank(s) with correct word
Parathyroid hormone and calcitriol
A. stimulate osteoclasts to resorb bone and release calcium into the blood. B. stimulate osteoblasts to resorb bone and lower blood calcium levels. C. stimulate osteoblasts to deposit bone by producing calcified matrix. D. stimulate osteoclasts to move calcium from the blood and into the bone.
Neural crest cells form ________.
A. postganglionic sympathetic nerves B. the adrenal medulla C. the hypothalamus D. Both the adrenal medulla and postganglionic sympathetic nerves are correct.