26. What structures meet at a neuromuscular junction? A. T tubules and sarcoplas

Question

26. What structures meet at a neuromuscular junction? A. T tubules and sarcoplasmic reticulun B. the sarcolemma and T tubules C the synaptic bulb of an axon and the sarcoplasmic resicul D, the synaptic bulb of an ason and the sarcolemma E. the synaptic bulb of us axon and thick myofilaments 27. A motor unit is one motor neuron (nerve fiber) that innervates the whole muscle B. one motor neuron (nerve fiber) and all of the skeletal muscle C. all of the neurons that stimulate a particular mascle D, the sareomeres of an individual myolibril all of the skeletal muscle fibers it stimulanes E. the quantity of neurotransomitter that is sufficient to stimulate muscle contractice 28. When acetylcholine is released from the symaptic knob what occurs next A. Ligand gated sodium channels open B. Ligand gated calcium channels open C. Voltage gated calcium channels o D. Voltage gated calcium channels close 29. What enayme is responsible for the breakdown of neurokransmitter after i synaptic cleft? A. peptidase B. creatine kinase C. acetylcholinesterase 30. What event "cocks" the myosin head once the actinomyosin cross-bridge is broken? A, the power stroke B. Calcium binding to troponin C. hydrolysis of ATP D. release of ADP plus Pi 31. The bacteria Clostridium tetani causes continsous release of acetyicholine (ACh). w does this have on skeletal muscles? A. Skeletal muscles will not contract B. skeletal muscles will not relax C. this will have no effect on skeletal muscles D. Causes hypertrophy E. None of the above are correct 32. Aerobic metabolism occurs in the A) golgi apparatus B) sarcoplasmic reticulurm C) mitochondria D) nuclei

Explanation / Answer

Ans 26) c) synaptic bulb of an axon and sarcolemma

The Sarcolemma is transparent and fine tubular sheath which is cell membrane of the striated muscle fibre cell. It envelops and protects the skeletal muscle fibres. The function of synaptic bulb helps in changing the action potential carried by axons into chemical message. It helps in process of synaptic transmission.

Ans 27) b) one motor neuron(nerve fibre) and all of the skeletal muscle fibres it stimulates.

The motor unit is made from one single nerve cell or neuron and it innervates the whole group of the skeletal muscles. The neurons are responsible for stimulating all the muscle fibres as they receive signal from the brain.

Ans 28) when acetylcholine is released from synaptic knob what occurs next

b) Ligand gated calcium channel opens. These types of channels open the moment they encounter or trigger any type of neurotransmitter.

Ans 29) c) acetylcholinestarase

As soon as the neurotransmitter is released in the synaptic cleft, it is inactivated and broken down by the presence of acetylcholinestarase. It is found in the synapse between the nerve and the muscle cells.

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