The release of calcium ions initiates muscle contractions. ... The contraction of a striated muscle fiber occurs as the sarcomeres, linearly arranged within myofibrils, shorten as myosin heads pull on the actin filaments.
Because of the presence of both activation and inactivation gates, voltage-gated Na channels can be all of these.
- Sodium voltage-gated channels can be either closed, open, or inactive.
- Voltage-gated sodium channels are closed when at rest. Both an activation gate and an inactivation gate are present in voltage-gated sodium channels.
- Although the inactivation gate is open, the activation gate is closed. This conformation is closed but capable of opening. Some of the activation gates open as a result of membrane depolarization brought on by a stimulus.
- Both the activation and inactivation gates will be opened at this point. As sodium ions enter the cells, nearby activation gates will open.
- A greater amount of sodium will enter the cells as a result, initiating an action potential.
- Both gates open when certain depolarization thresholds are reached. Action potential increases to its maximum as sodium rushes into the cell.
- The inactivation gate will gradually close and the permeability of the membrane to sodium ions will decrease. The channel is now in a state known as "closed but not capable of opening."
- Up until the membrane potential reaches its resting state, this occurs. The channels once more assume the "closed but capable of opening" conformation when resting values are attained.
learn more about Na channels here: brainly.com/question/12977601
#SPJ4
Ben walks to college every day. While participating in a race, he observes that his breathing rate is <u>higher</u> than his breathing rate when he walks. He also notices that his breathing rate is <u>lower</u> when he lies down.
In this statement, the term "breathing" refers to the gaseous exchange that occurs during inhalation, where CO₂ (carbon dioxide) is released, and exhalation, where O₂ (oxygen) is taken in. The process through which cells produce energy is referred to as "respiration".
Breathing is controlled by the autonomic nervous system, which ensures a synthesis between the actions of the sympathetic system by accelerating the respiratory rate and reducing amplitude, as in Ben's case when participating in a race. Meanwhile, the parasympathetic system is slowing down the respiratory rhythm and increasing amplitude, as in Ben's case when he is lying down.
Learn more about celullar respiration here: brainly.com/question/14158795
#SPJ4
Fossils and rocks identical to each other wet found on separate continents because rocks and the animals that formed those fossils can't swim the logical explanation was that the continents split after the rocks and fossils were formed
Answer:
I think the heat cools and the bloon is brought back down
Explanation:
hope this helps