Nerve impulses can travel up to 480,000 feet per second.
Answer the following statement true (T) or false (F)
False
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What action is most responsible for the resting membrane potential in cardiac muscle cells?
A. Movement of Ca2+ through voltage-gated Ca2+ channels. B. Closing of Na+ and K+ voltage-gated channels C. Movement of K+ through voltage-gated K+ channels D. Movement of Na+ through open Na+ channels
A substance is in positive balance when
A) it exits plasma at a greater rate than it enters plasma. B) its production by cells is decreased. C) it enters plasma at a greater rate than it exits plasma. D) its usage by cells is increased. E) it enters plasma at the same rate it exits plasma.
From ages 20 to 70, we see a loss of lean body mass as a result of up to 30% loss in the number of muscle cells, atrophy of muscle cells, and a general decrease in muscle strength.
Answer the following statement true (T) or false (F)
How are the endocrine organ system and nervous organ system alike?
A) They both send nerve impulses. B) Each of the systems regulates different activities. C) Together, they both regulate most of the activities of the body. D) They both have many disorders associated with them. E) One system is more involved with young life, whereas the other becomes more important later in life.