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Is it true that ADH increases water re-absorption from urine into blood by increasing the permeability of the distal consulates tubules and collecting ducts?
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Does increasing membrane permeability affect the time it takes for the osmometer to reach equilibrium?
It should. The permeability of a membrane defines how fast substances move across a membrane from a high concentration environment to the lower concentration environment. The more permeable the membrane the sooner equilibrium is reached when the concentrations on both side are the same.
What are two ways of making electromagnets stronger?
1. By increasing the number of turns of coil wound 2. BY using cores B = Ur Uo n I Here magnetic induction B is equated to relative magnetic permeability Ur of the core material and Uo the magnetic permeability of free space. N- the number of turns on the coil and I the current passing
What Hyperpolarizing membrane potential occurs in the postsynaptic membrane of a synapse?
Hyperpolarization means that the membrane potential becames more negative than the resting potential. This means that it is more difficult for an action potential to be triggered at the postsynaptic membrane. This occurs at inhibitory synapses. Hyperpolarization can be achieved by increasing the permeability of the membrane to potassium or chloride ions. If potassium permeability is increased more potassium ions will leave the cell, down their concentration gradient; if chloride permeability increases chloride ions will enter the cell down their concentration gradient. Both movements will make the inside of the cell more negative ie they will cause hyperpolarization.
What are two effects of Angiotensin II?
Angiotensin II has 4 effects: (overall effect is to increase Blood Pressure and Blood Volume) - 1. The adrenal cortex (Zona Glomerulosa) 2. Triple effect on the Nervous System 3. Supraoptic nucleus of the hypothalamus 4. Vasoconstricts smooth muscle - 1. There are Angiotensin II receptors in the Zona Glomerulosa - stimulates release of Aldosterone - 2. Direct effect on the sympathetic nervous system, increasing output. Second effect on postganglionic nerve endings inhibiting the reabsorption of Norepinephrine (i.e. increasing concentration of neurotransmitter - increasing stimulation). Third effect on reception of tissue to NE. - 3. Stimulates Supraoptic nucleus to release Anti Diuretic Hormone - 4. Direct effect on smooth muscle of a. venous system (increasing venous return, stroke volume and therefore contractility of heart muscle and cardiac output - increasing systolic blood pressure). b. arterial system (increasing resistance to blood flow, and increasing diastolic blood pressure).
Calcium reabsorption by the kidneys is promoted by the hormone?
Parathyroid hormone not only increases the re-absorption of calcium from the kidney but it also helps absorption in the intestines by increasing the production of vitamin D activation which also occurs in the kidney.
What is the meaning of vasopressin?
vasopressin is an antidiuretic hormone responsible for increased permeability of the distal tubules of the kidney, increasing water reabsorption and reducing urine volume.
What decreases water loss by increasing reabsorption of water into blood and decreasing urine production?
ADH
Explain how antidiuretic hormone can help regulate hypotension Be specific?
it can help by increasing reabsorption of water by the kidney. With the reabsorption, blood plasma volume increases, thus raising blood pressure
Why does cholesterol lower membrane permeability?
It sticks to the phosphate heads, preventing motion and increasing hydrophobic reactions.
How does the reabsorption of sodium and water from the renal tubules increase blood volume?
When blood volume is low, sodium reabsorption in the kidneys is stimulated. The increased sodium increases osmotic pressure, causing water to be reabsorbed with the sodium. The reabsorbed water is added to the plasma, thus increasing blood volume.
Would an increase in tubular reabsorption decrease urine output?
This question is asking about a general phenomenon seen in the kidney: tubular reabsorption. The kidney tubules reabsorb lots of things, so you'd have to be specific in order to get a correct response. If you're asking whether, say, increasing tubular reabsorption of sodium would decrease urine output, the answer is yes assuming normal physiology.
How does the renal system works to maintain an appropriate level of fluid in the body?
Antidiuretic Hormone is made in hypothalamus (posterior pituitary gland). Stimulated by dehydration and increased blood osmosis. It acts on the collecting duct of nephron to increase amount of aquaporins, thus increasing water permeability. When increased water is reabsorbed, blood osmolarity decreases. Therefore the urine becomes more concentrated.
What is the function of the hormone antidiuretic?
Arginine vasopressin (AVP), also known as vasopressin, argipressin or antidiuretic hormone (ADH), is a neurohypophysial hormone found in most mammals. Vasopressin is responsible for increasing water absorption in the collecting ducts of the kidney nephron.[1] Vasopressin increases water permeability of kidney collecting duct by inducing translocation of aquaporin-CD water channels in the kidney nephron collecting duct plasma membrane.[2] Vasopressin is a peptide hormone that controls the reabsorption of molecules in the tubules of the kidneys by affecting the tissue's permeability. It also increases peripheral vascular resistance, which in turn increases arterial blood pressure. It plays a key role in homeostasis, by the regulation of water, glucose, and salts in the blood. It is derived from a preprohormone precursor that is synthesized in the hypothalamus and stored in vesicles at the posterior pituitary. Most of it is stored in the posterior pituitary to be released into the bloodstream; however, some AVP is also released directly into the brain, where it plays an important role in social behavior and bonding.Source: WikipediaThe function of the antidiuretic hormone is to conserve water. The word means: anti- (against), and -diure- (urine).to prevent dilute urineit decreases removal of water by the kinedysto help you retain water
Does increasing membrane permeability affect the time it takes for the osmometer to reach equilibrium?
It should. The permeability of a membrane defines how fast substances move across a membrane from a high concentration environment to the lower concentration environment. The more permeable the membrane the sooner equilibrium is reached when the concentrations on both side are the same.
How does the relative permeability of a ferromagnetic material vary with magnetomotive force?
There are a lot of subtle things associated with the answer to this question, but it might be best to answer by saying that with increasing magneto-motive force (MMF), the permeability of the material doesn't really change that much until the magnetic saturation of the material is approached.
Are hermit crabs decreasing or increasing?
the wild populations of land hermit crabs are decreasing because of people collecting them for the pet business :(
Where is osmolarity greatest in kidney?
Osmolarity is greatest in the innermost portion of the medulla near the renal pelvis due to the osmotic gradient. As one goes deeper into the renal medulla, the osmotic gradient increase. The osmolarity varies from 300 mOsm at the edge of the medulla to the innermost at approximately 1200-1400 mOsm. Think of the movie, Silence of the Lamb, when Anthony Hopkins eats that kidney, as he eat closer and closer to the kidney, it get salter. The medullary osmotic gradient is used for water reabsorption in the collecting duct, when ADH is present, thus increasing blood volume and result in increasing blood pressure.
