An action potential requires ______
A) voltage-gated sodium channels to open
B) sodium to flow with its electrochemical gradient
C) chemically gated sodium channels to open
D) voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
Ans: D) voltage-gated sodium channels to open and sodium to flow with its electrochemical gradient
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Why do steroids take so long to generate change when they bind to intracellular receptors?
A) The intracellular receptors have very slow kinetics. B) The bound receptors affect gene transcription rates. C) The steroid receptor complex activates signal transduction pathways. D) The steroid receptor complex must then exit the cell to exert its effects.
Muscles that protract the scapula would be ________ thoracic muscles
A. anterior B. posterior
Which of the following was an adaptation that evolved in connection with human upright walking?
A. Hair B. Stereoscopic vision C. Spinal and pelvic anatomy D. Fully opposable thumbs E. Color vision
Skeletal muscle is described as ________.
A. nonstriated and involuntary B. striated and voluntary C. fibrous and containing ground substance D. striated and involuntary E. nonstriated and voluntary