Question: Two major types of muscle fibres are found in humans_____________?

• 1. white and brown
• 2. White and yellow
• 3. White and gray
• 4. White and red

Question: The absolute refractory period of an action potential is due to _______________?

• 1. Insufficient neurotransmitter
• 2. Depletion of intracellular Na+
• 3. Inactivation of Na+ k+ ATPase
• 4. Voltage inactivation of the Na+ channel

Question: Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?

• 1. Adaptation
• 2. Accommodation
• 3. Refractoriness
• 4. Electrotonus

Question: The number of muscle fibers in a motor unit are least in______________?

• 1. Laryngeal muscles
• 2. Pharyngeal muscles
• 3. Muscles of middle ear
• 4. Extraocular muscles

Question: Succinyl choline acts to block neuromuscular transmission by_______________?

• 1. Inhibiting cholinesterase
• 2. Inhibiting the CNS
• 3. Depolarizing the motor end plate of skeletal muscle
• 4. Blocking the release of acetyl choline at the end plate

Question: Non true regarding Na/K pump is______________?

• 1. Pumps Na against a gradient
• 2. 5 Na+ exchanged for 2K+
• 3. Increase in intracellular Na
• 4. Hypocalcemia inhibits the pump

Question: A motor unit is made up of______________?

• 1. A flexor muscle and an extensor muscle
• 2. A single skeletal muscle and all the motor peurons that supply it
• 3. A single motor neuron and all the muscle fibers it innervates
• 4. All the motor neurons in which response are observed after maximal stimulation of a single sensory nerve

Question: The neuromuscular transmitter released at neuromuscular junction is_______________?

• 1. Dopamine
• 2. Epinephrine
• 3. Nor epinephrine
• 4. Acetylcholine

Question: In myasthenia gravis_______________?

• 1. there is lack of acetyl choline
• 2. Lack of acetyl choline receptors
• 3. There is isometric contraction
• 4. Muscles are rigid and tough

Question: Tendon (or) ligament is attached to a bone through ____________?

• 1. Tomes fibers
• 2. Interstitial fibers
• 3. Sharpey’s fibers
• 4. Haversian fibers