The Plasma Membrane of an Excitable Cell Is More Permeable

question 115

Multiple Choice

The plasma membrane of an excitable cell is more permeable to potassium ions because

• A)of its positive electrical charge.
• B)there are more leak ion channels for K+ than Na+.
• C)protein molecules cannot exit through the cell membrane.
• D)calcium ions block Na+ and Cl- channels.
• E)there are more gated channels for K+.

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Definitions:

Catch Up Developmentally

The process in which children who have experienced delays in certain areas of development make significant progress to reach the expected level of development.

Gestational Age

The period of time measured from the first day of a woman's last menstrual period to the current date, usually used to assess the developmental progress of a fetus during pregnancy.

Low Birth Weight

A term describing infants who are born weighing less than 2,500 grams (5 pounds, 8 ounces), which can be associated with various health and developmental risks.

Gestational Age

The age of an embryo or fetus calculated from the first day of the mother's last menstrual period, often used in assessing developmental milestones and pregnancy progress.