Joe was examined by a nurse practitioner. She notes that the wound is approximately 1 cm deep, and there is exposed muscle tissue with areas of apparent tissue death. In addition, Joe's head and neck muscles are in a continuous spasm. They resist passive flexion and extension, and there is increased tone in his muscles of mastication and muscles of facial expression. The findings from the physical exam lead us to think that there may be more to this story than a simple wound infection. The continuous spasm of the muscles of the head, neck, and face indicates something potentially more serious. Remember that the muscular system is responsible for vital functions such as breathing, so any disturbance in skeletal muscle homeostasis must be closely monitored. Which of the following proteins associated with the myofilaments would be most involved in the muscle spasms? A. TropomyosinB. TroponinC. TitanD. Actin

The correct answer is D) Actin

Explanation:

50% of the muscle is comprised of myofilaments.  

Myofilaments or thin filaments comprise three different proteins—actin, tropomyosin, and troponin.

25% of the protein of myofilaments is Actin. The Actin protein is the major component of the thin filaments in muscle.

The Actin along with Myosin allow nerve impulses to be transmitted throughout the myofil. When Actin and Myosin interact with adenosine triphosphate (ATP), the energy required for muscle contraction is released. Actin and myosin filaments are stretched in opposing directions thus creating a shortening in muscles.

Cheers!

a. population growth is decreasing

-2

+4

-10

-3

-8

-3

so the population decreased by 24 because 3+3+8+10+2=26-2=24.

hoped i !

explanation:

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.