Which of the following organ systems is not involved in excretion?
a. urinary system
b. respiratory system
c. integumentary system
d. lymphatic system
D
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Which of the following describes a mechanism that brings the internal environment back to normal?
A) integration B) regulation C) positive feedback D) negative feedback E) homeostasis
A threshold potential is
a. the same value in every cell b. the peak potential achieved during an action potential. c. the point at which there is an explosive increase in Na+ permeability. d. the potential at which K+ permeability increases. e. always a positive potential.
Answer these questions about chromosome structure. What does "C" represent?
A. Proteins B. Chromosome C. Chromatid D. Chromatin E. Centromere
What are differences and similarities between "crude" touch and "fine" touch sensations?
What will be an ideal response?