Answer:
A
Explanation:
They are very far away compared to the sun
Answer:
3.) How do you know when the first day of the menstrual cycle is? What happens?
A.) first day of menstrual bleeding is considered Day 1 of the cycle.
4.) What is the function of FSH?
A.) FSH helps control the menstrual cycle and stimulates the growth of eggs in the ovaries.
<u>-TheUnknownScientist</u>
No a rock is not that strong
Answer:
C The sarcomere is contracted, and the actin and myosin filaments are completely overlapped.
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 calcium into the sarcolemma. 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 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.
In the sarcomere, which is the contractile unit of skeletal muscles, there are
- Thick myosin myofilaments in the central region belonging to the A band.
- Thin filaments united to the Z lines, extending in the interior of the A band until they reach the border of the H band.
- Thin actin filaments composing the I band, which belong to two sarcomeres adjacent to a Z line.
When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in the length of the sarcomere. The H line and the I band get shorter. The Z lines get closer to the A band, meaning that they get closer to each other. A band keeps constant in length. This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.
Answer:
a fungus
Explanation:
Fungi is any group of eukaryotic organisms , and examples are yeast, molds and mushrooms.
They are known to be common in the environment, because they can live in the air, soil, water and plants. And they are known to grow best or thrive under a warm condition.
They are classified into four divisions , they include
* Chydridiomycota
* Zygomycota e.g bread mold
* Ascomycota e.g Yeast
* Basidiomycota e.g club fungi
In this case, the organism that will be noticed on the jar after several weeks will be a fungus, because , the mold is a type of fungus that feed saprophitically on food substances. Also the fungus grow best in a warm temperature.