Which statement accurately states what happens when a muscle contracts?

a) calcium combines with atp to produce sarcomeres
b) myosin head attach to and pull on a series of actin-binding sites
c) actin produces myosin and atp
d) calcium produces contractions

Which type of bond forms between water moleculesstrong bondhydrogen bondcovalent bondpolar bond

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success