In what order do these three organ systems of the human body operate during a reflex arc in response to a stimulus of sharp pain to the hand? A.
muscular, nervous, skeletal
B.
nervous, muscular, skeletal
C.
skeletal, nervous, muscular
D.
skeletal, muscular, nervous

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.