Answer:
- Calcium binds to troponin C
- Troponin T moves tropomyosin and unblocks the binding sites
- Myosin heads join to the actin forming cross-bridges
- ATP turns into ADP and inorganic phosphate and releases energy
- The energy is used to impulse myofilaments slide producing a power stroke
- ADP is released and a new ATP joins the myosin heads and breaks the bindings to the actin filament
- ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, starting a new cycle
- Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
Explanation:
In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing <u>calcium into the sarcolemma.</u> At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join to the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament. Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.
When it triggers an abnormal or vigorous immune responce, treating the antigen that would normally cause no threat as something harmful.
The word below Is the answer
<span>If factors are only
rounded up, then the estimate is an overestimate. If factors are only rounded down, then the
estimate is an underestimate. When some factors are rounded up and some are rounded
down, it is harder to tell whether the estimate is an overestimate or an underestimate.</span>
Answer: d) Cabbage.
Explanation:
A fruit can be define as a fleshy product of the plants. It encloses within it seeds produced after the sexual mode of reproduction of the males and female gametes in plants. The fruit can be sour, or sweet.
Among the option given cabbage is the correct option. This is because of the fact that cabbage is a leafy green biennial vegetable crop. It exhibit dense leaved head. The white and red varieties are also available with tightly packed leaves.
