Anatomy and Physiology Chapter 9 &10 questions with correct answers

A sacromere is the distance between two what? - Answer I Bands The blank contains only the actin filaments - Answer Z Disc The thicker filaments are the what filaments? - Answer Myosin Both actin and myosin are found where? - Answer in the A band This serves as a trigger for muscle contraction by removing the inhibition of troponin molecules, what is it? - Answer Calcium ions A neurotransmitter released at motor end plates by the axon terminals - Answer Acetylcholine Diffusion across the cell membrane results in depolarization - Answer Sodium-potassium ions Destroys ACh - Answer Acetylcholinesterase What is the role of tropomysin in skeletal muscle? - Answer tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules Job of myoglobin - Answer stores oxygen in muscle cells