Exam 1 Study Guide

What is the main function of negative feedback?

A. to maintain homeostasis
B. to control body movement
C. to regulate excretion via the kidneys
D. to keep the body's blood sugar level high

Which of the following is FALSE regarding the membrane potential?

A. The resting membrane potential is determined mainly by the concentration gradients and differential permeability of the plasma membrane to K+ and Na+ ions
B. In their resting state, all body cells exhibit a resting membrane potential
C. The resting membrane potential is maintained solely by passive transport processes.
D. The resting membrane potential occurs due to active transport of ions across the memrbane due to the sodium-potassium pump.

Which type of cell junction acts as anchors and distributes tension through a cellular sheet and reduces the chance of tearing when it is subjected to great mechanical stress?

A. gap junctions
B. tight junctions
C. connexons
D. desmosomes