Tetanus of muscles is described as Select one: a. action potential frequency is high enough that no relaxation of muscle fibers
occurs. b. a muscle produces constant tension during contraction. c. a muscle produces an increasing tension during contraction. d. a muscle produces increasing tension as it shortens. e. a muscle produces tension, but the length of the muscle is increasing.
Answer: a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
Explanation:
A tetanic contraction occurs due to repeated stimuli at short intervals. In this situation, the muscle fiber does nor relax and contracts again. It is a process of sustained contraction of muscles, which evoke when the motor nerve innervates a skeletal muscle and emits the action potential at high rate. The muscles become hyperactive in this condition.
Identifying the fossil is the first step. We have already identified this fossil as a clamshell. We know clam are from the sea, but if you didn't, you could conclude this from knowing where you found the fossil (likely near the beach). Discovering where it is can also lead you to a conclusion on it's arrival as a fossil, perhaps washed up on shore or buried by an animal.
