Animal Physiology Question 1. Describe the process of skeletal muscle contraction starting from an action potential...

Animal Physiology Question

1. Describe the process of skeletal muscle contraction starting from an action potential being sent down a motor neuron to the contraction of the sarcomere.

Solutions

Expert Solution

The action potential for a muscle contraction is generated and it reaches a neuromuscular junction. The action potential arrives at the axon ends of the neuron. There are synaptic vesicles in which acetylcholine is stored. It gets fused with the presynaptic membrane and the vessicles release acetylcholine to the synaptic cleft by the opening of voltage gated calcium channels. The acetylcholine then binds to the receptors in the motor end plate of post synaptic membrane. This cause the release of calcium to the sarcoplasm through T tubules which isvtge lead to the muscle contraction. The Ca2+ ions binds to the troponin and removes the troponin tropomyosin blockade that blocks the active sites of actin. This makes the site ready for the binding of myosin. The myosin head undergo hydrolysis process which converts ATP to ADP. This makes the myosin head at a high energy level and thus bind to the active sites of actin. Thus a cross bridge is formed. As strong the stimuli is the myosin binding to the actin increases making more crossbridge. The filaments now slide one over the other making the sarcomere to decrease it's length. The sacomere is the unit of muscle contraction. The reduced length of sarcomere marks the strength of a mucsle contraction.

Sydney Mullin answered 10 months ago

Next > < Previous

Related Solutions

Describe the process of skeletal muscle contraction starting from an action potential being sent down a...

Describe the process of skeletal muscle contraction starting from an action potential being sent down a motor neuron to the contraction of the sarcomere.

Explain the process of skeletal muscle contraction from action potential being sent from the brain or...

Explain the process of skeletal muscle contraction from action potential being sent from the brain or spinal cord through muscle contraction and relaxation.

Describe the process of excitation-contraction coupling in a skeletal muscle fiber, starting at the very beginning...

Describe the process of excitation-contraction coupling in a skeletal muscle fiber, starting at the very beginning and working your way to the end of the process. Make sure you discuss all relevant steps in the correct order.

Discuss skeletal muscle contraction beginning with the Action Potential arriving at the Neuromuscular junction and ending...

Discuss skeletal muscle contraction beginning with the Action Potential arriving at the Neuromuscular junction and ending with relaxation. (Make sure to include which ion channels are activated and how, changes in membrane potential as a result of the movement of those ions, and WHERE ATP IS USED – 3 PLACES!!!).

Explain the entire process of contraction in a skeletal muscle, starting with how the signal enters...

Explain the entire process of contraction in a skeletal muscle, starting with how the signal enters the muscle cell at the neuromuscular junction. Include all relevant ions, molecules, structures, and processes in your explanation. How does the muscle carry out a sustained contraction? How does a muscle relax? How does skeletal muscle differ from the other two muscle types?

Explain the entire process of contraction in a skeletal muscle, starting with how the signal enters...

Topic 6: Skeletal muscle contraction Describe in detail the entire process of excitation coupling in skeletal...

Topic 6: Skeletal muscle contraction Describe in detail the entire process of excitation coupling in skeletal muscle, begin with an action potential reaching the synaptic knob of a motor neuron through completion of a cross Bridge cycle. after detailing those events to include the following information Define a motor unit describe motor unit recruitment and Explain how these terms relate to excitation-contraction coupling. Define and describe muscle twitch and summation and explain how these terms relate to motor unit/motor unit...

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential...

Compare and contrast cardiac and skeletal muscle in the following: Cellular structure Excitation-Contraction Coupling Action potential of Skeletal Muscle cells and Cardiac Contractile muscle cells Production of ATP Role of Calcium Mechanisms for increased strength/force of contraction

Animal Physiology question 1. The absolute and relative refractory periods of an action potential determine other...

Animal Physiology question 1. The absolute and relative refractory periods of an action potential determine other parameters of action potentials such as causing unidirectional conduction and limiting their frequency (i.e. how often) they can be fired. What is the absolute refractory period and what causes it? What is the relative refractory period and what causes it? How do these two refractory period affect unidirectional conduction? How do these two refractory periods affect the frequency that APs can be generated?

Describe the molecular mechanism of skeletal muscle contraction in detail.

Subjects