The beginnings of a brain first become apparent around four weeks after conception when the neural plate folds to form the neural tube
<span>The major structure that supplies the cells with nutrients and removes their waste is the circulatory system. The circulatory system is composed of the heart, the blood vessels going from and back to the heart, and the blood that travels inside them. The blood vessels that carry nutrient and oxygen-rich blood to the cells are arteries. They become the thinner arterioles, and then the thinnest capillaries. With the exception of the pulmonary arteries, which carry non-oxygenated blood from the heart to the lungs, all arteries carry oxygenated blood. The capillaries disburse the nutrients and oxygen to the cells and pick up wastes and carbon dioxide, form into the thicker venules, then to form veins, which lead back to the heart (with the exception of the pulmonary veins, which carry oxygenated blood from the lungs to the heart). Veins also differ from arteries in that veins have valves to prevent blood from flowing backward.</span>
A group of subjects closely followed up together , also has mat variables
Answer:
Complete Tetanus
Explanation:
The nerve stimulus arrives at the fiber at such a rapid pace that there is no decrease in tension between stimuli detected. This results in a tectanic contraction that is fused (complete) . Thus the muscle fiber does not relax at all due to this complete tetanus.
Answer:
The movement of a single caribou into a herd is an example of
Immigration.
