The pine tree has unprotected seeds; the apple tree has seeds in fruit. The pine tree is vascular; the apple tree is a seedless, nonvascular plant. The pine tree thrives in warm climates; the apple tree thrives in cold climates.
Answer:
d I think... ................
Answer:
The correct order is: 6) Sarcoplasmic reticulum releases calcium ions, 2) Calcium ions bind to troponin, 5) Tropomyosin moves to expose active sites of actin, 4) ATP is split into ADP and P, 1) Myosin head binds to actin, 7) ADP and P released from myosin, 3) Myosin cross-bridges bend, pulling actin toward center of sarcomere.
Explanation:
The ability to contract is an important property of the muscle cells and is fundamental to animals because muscles not only make locomotion possible but are also responsible for the correct functioning of organs (including the heart).
The mechanism behind muscle contraction is the sliding of filaments in a structure called sarcomere, which mostly involves the presence of actin and myosin filaments.
For muscle contraction to happen, there needs to be a <u>stimulus coming from the nerve that innervates said muscle</u>. This stimulus generates the release of <u>calcium ions</u> that will bind to a protein called troponin and will lead to the exposure of the active site of actin so it can bind to the myosin head. <u>This process requires ATP</u>.
Answer:
One hint is that, if a message is being sent, the "sender" is probably the nervous systems. There are several subsystems to the nervous system, but it regulates and controls virtually all bodily functions. The nervous system monitors your body's temperature, and takes actions to regulate it, such as telling your muscular system to shiver to generate more heat. It sends this message to the muscular system because your muscles cause bodily movement, such as walking, lifting weights, and even shivering.
When your nervous system determines that your body temperature has returned to normal, it again sends a message to your muscular system to stop shivering.
