1. Contraction
2. Actin
3. Tendons
4. Epidermis
5. Dermis
6. Acne
7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.
For Penn Foster.
Answer:
The correct sequence of muscle contraction from first to last is given below
Explanation:
step 1 myosin head interacts with actin
step 2 ATP binds to myosin head
step 3 ATP is converted to ADP and Pi
step 4 ADP and pi are released from myosin
step 5 Myosin head pivots in the power stroke
step 6 Myosin head is cocked back.
It will be half
A normal cell contains 46 chromosomes.
Gametes only contain 23 because they will be paired with an opposite gamete cell upon fertilisation
- Egg contains 23
- Sperm contains 23
Together they make the normal amount of 46
B, ocean trenches are formed after a underwater volcano has erupted.<span />
Adaptations such as keen eyesight and ability to visualize colors allows the bees to find food while increasing the plants chances of pollination.
<h3>What are adaptations?</h3>
Adaptation refers to the special features an organism possess that enhances its chances of survival in its environment.
The adaptations in bees such as eye structure help them to easily locate flowers to obtain nectar.
The plants themselves are benefited as they can easily get pollinated by the bees.
Therefore, adaptations such as keen eyesight and ability to visualize colors allows the bees to find food while increasing the plants chances of pollination.
Learn more about adaptation at: brainly.com/question/29594
