Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
The correct answer is B. Adrenaline is the hormone that is released when the body or mind is under stress
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Answer:
The nervous system does depend on the circulatory and digestive system because it would not be able to work without a beating heart or if the person does not have any food, basically they would not be alive. However, the circulatory and digestive system need the nervous system to work. For example, the nervous system sends signals to the brain when there is pain in the stomach, meaning that you are hungry. It also tells the brain that you are full. For the circulatory system, the whole circulatory system is made up of all the electrical impulses that are part of the nervous system. They help your heart to beat and pump blood to your entire body.
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Answer:
Hemoglobin bound to oxygen absorbs blue-green light, which means that it reflects red-orange light into our eyes, appearing red. ... But this is wrong; human blood is never blue. The bluish color of veins is only an optical illusion. Blue light does not penetrate as far into tissue as red light.
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