Answer:
The correct answer will be:
1. Acetylcholine binds to receptors on the motor end plate
2. Chemically-regulated ion channels open, causing depolarization
3 End plate potentials trigger action potential(s).
4. Transverse tubules convey potentials into the interior of the cell
5. Ca++ is released from the sarcoplasmic reticulum
6. Ca++ binds to troponin, pulling on tropomyosin
7. Binding sites on actin are uncovered, allowing myosin to bind and carry out power strokes
8. Force increases.
9. Ca++ is pumped (re-sequestered) into the sarcoplasmic reticulum
10. Force decreases.
Explanation:
The muscle contraction is a highly controlled mechanism which begins at the neuromuscular junction with the release of the acetylcholine neurotransmitter. This neurotransmitter causes the depolarization of the membrane by binding to the receptors of the motor end plate which generates an action potential. This action potential is transmitted via T-tubules from sarcolemma to the sarcoplasmic reticulum.
The sarcoplasmic reticulum releases calcium ions which binds to the troponin protein. This troponin removes the protein tropomyosin from the actin causing the rotation of the tropomyosin exposing the binding sites for myosin. The myosin binds to the actin using energy from the ATP which pulls the actin causing contraction. Another ATP binds the myosin head which weakens the bond between myosin and actin which releases the myosin which decreases the force between them decreases and the muscles relax.
Answer:
When the forearm is extended at the elbow joint, the <u>triceps brachii</u> muscle acts as the prime mover.
Explanation:
Triceps brachii -
Triceps brachii is one of the largest muscle which is presents on the back of the upper limbs of many vertebrates.
The origin of the muscle is Infraglenoid tubercle of scapula.
And
The insertion of the muscle is Posterior olecranon process of ulna.
Actions of Triceps Brachii Long Head are extending the forearm at elbow and extends the arm at the shoulder.
Hence ,
When the forearm is extended at the elbow joint, the <u>triceps brachii</u> muscle acts as the prime mover.
Answer: b. nicotine use
Explanation:
Studies have shown that smoking reduces the speed at which bones heal from injuries and even though the data is sometimes conflicting, nicotine has been blamed for this impairment.
Vitamins heal bones and so do protein so options a and d are incorrect. Being immobilized gives bones the chance to heal so option c is incorrect as well.
Answer:
Many cells in the body have extensions of their cellular menbrana, which depending on their length can be cilia or microvilli, which are the shortest. We see the case, for example, the microvilli found in the small intestine, more abundant at the level of the second and third portions of the intestine, which favors the great absorption of liquids, proteins and nutrients that occur at this level.
Cilia are cellular structures that have a more defined formation and are characterized by their nucleus being made up of proteins and enveloped by the cytosol and plasma menbrana. They are presented as an appendix in the form of hair; We will find these cilia in the cells of the respiratory system and in the reproductive system where they help the mobility of foreign bodies (respiratory system) and the movements of sperm (reproductive system).