Question: Electromyography is used for________________?

• 1. To study muscle activity
• 2. Determine class II malocclusion
• 3. Determine the centric relation
• 4. Determine the centric occlusion

Question: Skeletal muscles______________?

• 1. Contracts when calcium is taken up by sarcoplasmic reticulum
• 2. Contracts when actin and myosin filaments shorten
• 3. Contraction is initiated by calcium binding to troponin
• 4. Contraction is initiated by calcium binding to tropomyosin

Question: The contractile element in a skeletal muscle is present in______________?

• 1. Sarcolemma
• 2. Sarcoplasm
• 3. Myofibril
• 4. Endomysium

Question: Which is caused by acetylcholine through nicotinic receptors_____________?

• 1. Contraction of skeletal muscle
• 2. Decrease of heart rate
• 3. Secretion of saliva
• 4. Contraction of pupils

Question: Which one of the following is a regulatory protein of the muscle ?

• 1. Troponin
• 2. Myosin
• 3. Actin
• 4. Protein- C

Question: Skeletal muscles_____________?

• 1. Contracts when calcium is taken up by sarcoplasmic reticulum
• 2. Contracts when actin and myosin filaments shorten
• 3. Contraction is initiated by calcium binding to troponin
• 4. Contraction is initiated by calcium binding to tropomyosin

Question: Cardiac muscle contracts due to______________?

• 1. Extracellular Ca+2
• 2. Sarcoplasmic ca+2
• 3. Extracellular Na+
• 4. Intracellular Na+

Question: Small packets of acetylcholine released randomly from the nerve cell membrane at rest Produces_______________?

• 1. Inhibitory post synaptic potential
• 2. Miniature end plate potential
• 3. Action potential
• 4. End plate potential

Question: Upstroke of action potential would lead to________________?

• 1. Net current in an outward direction
• 2. Cell interior becomes more negative
• 3. Cell interior becomes less negative
• 4. None of the above

Question: The main types of muscle cells are______________?

• 1. Skeletal and cardiac
• 2. Smooth and cardiac
• 3. Smooth and skeletal
• 4. All of the above