Question

Question Completion Status: QUESTION 1 The neurotransmitter released at the neuromuscular junction to signal a muscle contraction is broken down by calicuase norepinephronase neuroglibin acetylcholinesterase QUESTION2 Exocytosis of the neurotransmitter at the neuromuscular junction requires activation of O voltage-gated calcium channels O chemically gated potassium channels O voltage gated sodium channels 0. chemically gated sodium channels Save All Answers 20 Dll F8 oD 69 F5 F6 F7 QUESTION 3 The H-zone of the A band of a sarcomere consists of: actin and myosin myofilaments actin and myosin myofilaments and troponin Oactin and myosin myofilaments and troponin and tropomyosin only myosin myofilaments QUESTION4 Calcium is stored: O in the t-tubule of the muscle cell O in the sarcoplasmic reticulum of the muscle cell O in the endomysium of the muscle cell within the I band of a sarcomere 10 28 uestion Completion Status: QUESTION 5 According to the sliding filament theory of muscle contraction: the I band increases in size thin filaments are pushed toward the M line of the sarcomere thin filaments decrease in length thick filaments are pushed toward the z line of the sarcomere QUESTION 6 In order for a muscle to contract, myosin must bind to actin. In order for this to occur Ocalcium must bind to troponin and troponin will move tropomyosin out of the myosin binding sites 0.1 on actin, Ocalcium must bind to troponin and troponin will move tropomyosin out of the actin binding sites on myosin. calcium must bind to tropomyosin and tropomyosin will move troponin out of the myosin binding sites on actin. calcium must bind to tropomyosin and tropomyosin will move troponin out of the actin binding sites on myosin. Save All Answers acBoo Dl F8 FS F6 F7 F9

Answer 1

1. Acetylcholinesterase

It breaks down acetylcholine in the synaptic cleft.

2. Voltage gated Calcium channels

Exocytosis is activated by calcium. These channels are found on the membrane of synaptic terminals.

3. Only Myosin myofilaments

The A- band of H- zone contains only Myosin filaments. Due to this, H-zone gets shorter during muscle contraction.

4. Sarcoplasmic reticulum

Calcium is stored in the sarcoplasmic reticulum of the muscle cells.