In some cases the epiphyseal plate of the long bones of children closes too early. What might be the cause?
A) elevated levels of sex hormones
B) too much vitamin D in the diet
C) overproduction of thyroid hormone
D) osteoblast activity exceeds osteoclast activity
A
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Which of the following is responsible for the falling phase of an action potential?
a. opening of Na+ gates b. Na+-K+ pump restoring the ions to their original locations c. greatly increased permeability to K+ d. ATP-ase destroying the energy supply that was maintaining the action potential at its peak. e. none of these answers.
Gum infections can lead to serious conditions, such as heart disease.?
Indicate whether the statement is true or false
Your friend trips and you lift your hand to help them up. In the process, you rotate your forearm so that your palm faces upward. This forearm movement is supination.
Answer the following statement true (T) or false (F)
Sperm are produced in the:
A) testes B) epididymis C) vas deferens D) scrotum