The cerebrum<span> makes up most of the brain. It contains the four lobes of the brain and all of the neocortex. The </span>cerebellum<span>, or little brain is the small, tough structure that lies underneath the posterior or back part of the brain</span>
Answer:
Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. One famous mass extinction event is the one that lead to the extinction of dinosaurs, 65 million years ago.
Explanation:
Plants need leaves, stems, and roots to do these jobs. But plants can have different leaf, stem, and root shapes depending on where they grow. The structures of plants are specially adapted to the environment in which they grow.
Answer:
- Flow through the renal tubule increases when glomerular filtration rate <u>increases</u>.
- When filtrate flow through the renal tubule increases, reabsorption of sodium chloride by the tubule <u>decreases</u>.
Explanation:
Renal tubules are structures that form part of the nephron -a functional unit of the kidney - whose function is the reabsorption of glomerular filtrate and the secretion of waste products, in addition to regulating the balance of water and body electrolytes.
The renal tubules are divided into:
- <em>Proximal contoured tubule, where most of the reabsorption occurs.</em>
- <em>Henle's handle, which is involved in electrolyte balance.
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- <em>Distal contoured tubule, responsible for the secretion of substances to be eliminated.
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The renal tubules are capable of reabsorbing 99% of the glomerular filtrate. The rate of glomerular filtrate is about 120 milliliters per minute, and the tubular flow depends on it, so if the glomerular filtrate increases, the amount of filtered fluid increases as well as the amount that flows through the renal tubule.
The water excreted by the kidney contains electrolytes -such as sodium, potassium, and chlorine- which it carries to the kidney's tubules. In order to achieve equilibrium, the tubules are responsible for reabsorbing and secreting electrolytes to maintain homeostasis.
However, certain conditions cause the tubular flow to increase, which prevents the adequate reabsorption of some electrolytes, such as sodium and potassium, decreasing their reabsorption and increasing their excretion, as happens with the use of diuretic drugs.
