Answer:
4,3,1,5,2
4. Vesicles full of acetylcholine are stored at the axon terminal.
3. Action potential arrives at the neuromuscular junction.
1. Action potential is propagated in the sarcolemma.
5. Acetylcholine is released into the synaptic cleft.
2. Acetylcholine binds to ligand gated sodium channels.
Explanation:
Nerve impulse is generated from somatic motor neurons and reaches neuromuscular junction. The nerve impulse specifically reaches a region named 'synaptic end bulbs' at axon terminal. These synaptic end bulbs are in turn connected to the motor end plate region of a sarcolemma.
As soon as the nerve impulse reaches neuromuscular junction, it triggers the opening of voltage gated ion channels which in turn facilitate the influx of Ca²⁺ from the extracellular fluid to the inside of neuron where synaptic vesicles containing neurotransmitter acetylcholine are already stored.
The Ca²⁺ causes the exocytosis of synaptic vesicles which fuse with the plasma membrane of motor neuron as a result of which acetylcholine is released in the synaptic cleft.
The acetylcholine further binds with the acetylcholine receptor which is present at the motor end plate of a skeletal muscle fibre. These receptors are ligand gated ion channels.
Binding of acetylcholine with its receptor causes the ion channels to open and cations like Na⁺ enter the muscle fibre so as to make the electric potential inside the muscle positive.
It is known as Arthrodesis. It is the manufactured enlistment of joint hardening between two bones by surgery. This is done to ease recalcitrant agony in a joint which can't be overseen by torment medicine, braces, or other regularly showed medications. The average reasons for such agony are breaks which upset the joint, extreme sprains, and joint pain.
Answer:
-Includes reptiles, birds, and mammals
-All amniotes are tetrapods and vertebrates
-May involve a shelled egg or internal gestation
-Do not need for moist environment for reproduction
-Derived characters that identify an amniotes are 3 extra embryonic membranes: Chorion, Amnion, Allantois
-are Covered by shells
-Most hard and calcified
-Some soft (monotremes)
