Facilitated diffusion requires energy and can transport molecules against a concentration gradient.
Indicate whether the statement is True or False.
Ans: False.
Explanation: Facilitated diffusion is similar to simple diffusion in that both involve movt of molecules down their concentration gradient and this movt is carried out w/o any input of energy
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Each of the following is an ascending tract in the spinal cord except the
A) gracile fasciculus. B) cuneate fasciculus. C) posterior spinocerebellar. D) reticulospinal tract. E) anterior spinothalamic.
Immunodeficiency diseases can be congenital, which means:
a. deadly b. present at birth c. acquired in childhood d. acquired in adulthood e. environmentally related
The purpose of the two small muscles, the tensor tympani and the stapedius, in the ear is to _______.
A. reduce damage to the earbones. B. protect the tympanic membrane. C. contract quickly when there is a loud sound. D. move the ossicles. E. All of the answers are correct
Which of the following events is NOT a characteristic of an action potential?
A. The plasma membrane becomes highly permeable to sodium ions and depolarization results. B. As sodium ions enter, the inside of the plasma membrane becomes more negative. C. At the peak of depolarization, sodium channels begin to close and potassium channels open. D. In repolarization, potassium ions flow out of the cell. E. Action potentials occur according to the all-or-none principle.