The process of muscular contraction occurs over a number of key steps, including:
Q. What enzyme would be used to treat curare toxicity?
The antidote for curare poisoning is an acetylcholinesterase (AChE) inhibitor (anti-cholinesterase), such as physostigmine or neostigmine.
Table of Contents
- Q. What enzyme would be used to treat curare toxicity?
- Q. What are the steps of the neuromuscular junction?
- Q. What is the first step in muscle contraction?
- Q. What is the sequence of events in muscle contraction?
- Q. Which mineral is important for muscle contraction?
- Q. Which filament is responsible for muscle contraction?
- Q. Which ion is important for muscle contraction?
- Q. Which of the following is incorrect regarding muscle contraction?
- Q. Which of the following is true wrt changes during muscle contraction?
- Q. Which of the following is incorrect wrt muscle fibers of skeletal muscle?
- Q. Can cardiac muscle be controlled?
Q. What are the steps of the neuromuscular junction?
Terms in this set (9)
- Nerve impulse arrives at axon terminal of motor neuron and triggers release of acetylcholine (ACh)
- ACh diffuses, binds to its receptors, and triggers muscle action potential.
- Acetylcholinesterase destroys A C h so more action potentials don’t arise.
- Depolarisation and calcium ion release.
- Actin and myosin cross-bridge formation.
- Sliding mechanism of actin and myosin filaments.
- Sarcomere shortening (muscle contraction)
Q. What is the first step in muscle contraction?
Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell.
Q. What is the sequence of events in muscle contraction?
The myosin head attaches to the myosin binding site on the actin filament forming an actinomyosin bridge· ATP is hydrolysed to ADP and inorganic phosphate as the cross-bridge forms (ATP hydrolase is activated by calcium ions so that ATP is hydrolysed)· The myosin head tilts in a rowing action, sliding the actin …
Q. Which mineral is important for muscle contraction?
Macrominerals
| Mineral | Function |
|---|---|
| Potassium | Needed for proper fluid balance, nerve transmission, and muscle contraction |
| Calcium | Important for healthy bones and teeth; helps muscles relax and contract; important in nerve functioning, blood clotting, blood pressure regulation, immune system health |
Q. Which filament is responsible for muscle contraction?
myosin filaments
Q. Which ion is important for muscle contraction?
calcium ions
Q. Which of the following is incorrect regarding muscle contraction?
During muscle contraction, actin and myosin form actomyosin, phosphate reserve comes from phosphocreatine and chemical energy is changed into mechanical energy. So, the correct answer is (d).
Q. Which of the following is true wrt changes during muscle contraction?
So, the correct answer is ‘A-Band remains constant’.
Q. Which of the following is incorrect wrt muscle fibers of skeletal muscle?
Answer. The incorrect statement is – 4. Z-line is a dark membrane which bisects A-band. One can see where actin and myosin filaments converge on any myofibril, in the frequently occurring dark bands, called Z lines.
Q. Can cardiac muscle be controlled?
Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker.
