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.
E) capacitation involves the removal of some inhibiting substance(s) from the sperm.
You might also like to view...
Bronchodilation of the air passages involves the ____ of their smooth muscle and the ____ of their radius
a. decrease; decrease b. decrease; increase c. increase; decrease d. increase; increase e. None of the above
List 5 common vaccines given to horses in a health program
What will be an ideal response?
The conversion of stimuli into neuron potentials
a. requires an adequate level of stimulus. b. is called transduction. c. stems from generation of receptor potentials. d. all of these answers. e. none of these answers.
Neuronal axons typically have abundant
A. voltage-gated channels for Na+ that open in response to depolarization. B. voltage-gated channels for K+ that open in response to hyperpolarization. C. ligand-gated channels for Na+. D. ligand-gated channels for K+. E. voltage-gated channels for Ca2+.