Permeability of which ion is affected by a positive feedback mechanism once threshold is reached?

a. sodium.
b. potassium.
c. calcium.
d. chloride.
e. protein.


A

Anatomy & Physiology

You might also like to view...

The ossicular system transmits the vibrations of the tympanic membrane to the oval window, movement of which first sets up pressure waves in the endolymph

Indicate whether the statement is true or false

Anatomy & Physiology

A reduction in the secretion of ____ may serve as the trigger for the onset of puberty

a. inhibin b. melatonin c. adrenal androgens d. gonadotropin-releasing hormone e. pituitary gonadotropic hormones

Anatomy & Physiology

Which of the following statements is not a tenet of modern cell theory?

A) All organisms are composed of cells and cell products. B) An organism's structure and all of its functions are ultimately due to the activities of its cells. C) All cells occupy space. D) The cell is the basic structural and functional unit of life. E) All cells come only from preexisting cells.

Anatomy & Physiology

Connie recently celebrated her 45th birthday. She feels okay most of the day, but in the morning, for about a half hour after she gets out of bed, all of her joints feel stiff. This is due to

A. sprains. B. torn ligaments. C. nerve damage. D. changes in collagen structure.

Anatomy & Physiology