2. A negative feedback system is the response to a stimulus in order to reduce its intensity. By scratching an itch, you are using a negative feedback system because the goal of scratching is to reduce the intensity of the itch. Scratching is an attempt to shut off the stimulus of the itching sensation, not to intensify it.
3. Saturated fats are fatty acids chains with a single covalent bond between the carbon atoms and their fatty acid chains are straight and at room temperature, the molecules pack together closely, forming a solid. An example of a saturated …show more content…
The calcium levels in a bone are too low, which activates a response from PTH. PTH then activates osteoclasts which dissolve the bony matrix until the calcium levels return to normal. This process breaks down the bone and makes it smaller.
10. The atlas is different from other vertebra because it has no body. The superior surfaces of its transverse processes have depressions, and these depressions hold the occipital condyles of the skull. The atlas allows you to nod your head up and down. The axis is a pivot for the rotation of the skull. It is different from other vertebra because it has dens, and this acts as the pivot point. The joint between the atlas and the axis allow you to rotate your head from side to side.
11. In the sliding filament theory, the myosin heads attach on the thin filaments, which causes the sliding to begin. The myosin cross bridges attaches and detaches during the contractions, which creates a tension and pulls the thin filaments to the center of the sarcomere. When ATP is generated, the myosin heads release the thin filaments, causing the muscle to