08454 002 If a person Influences the secretion of ADH. Less ADH is secreted from the pituitary gland, the walls of the tubules become less permeable, less water is re-absorbed into the blood vessels, and therefore more urine is released. A person can become dehydrated if he/she loses too much water 9 9 blood. Because of increased and collecting tubule become This causes more water to leave the tubule The water that there is in the medulla is re-abs blood capillaries. The amount of water in the blood thus increases The tubule however has less water, forming ve dy LFSC Gr 12/ Assignment 3 August 2021 1.2.6 The picture below shows how important the skin is in controlling the core body temperature in very warm conditions. On a hot day, the hypothalamus is stimulated and sends impulses to the blood vessels More sweat is released. Evaporation of the sweat cools the skin. Sweat gland becomes more active. Blood vessels dilate (become wider). This is called vasodilation. More blood flows to the skin. . More heat is lost from the skin. More blood is sent to the sweat glands. Using the information provided draw your own picture, alongside the one given, showing how the skin controls body temperature in cooler conditions. (5) (14) TOTAL QUESTION 1: (20)

08454 002 If a person Influences the secretion of ADH. Less ADH is secreted from the pituitary gland, the walls of the tubules become less permeable, less water is re-absorbed into the blood vessels, and therefore more urine is released. A person can become dehydrated if he/she loses too much water 9 9 blood. Because of increased and collecting tubule become This causes more water to leave the tubule The water that there is in the medulla is re-abs blood capillaries. The amount of water in the blood thus increases The tubule however has less water, forming ve dy LFSC Gr 12/ Assignment 3 August 2021 1.2.6 The picture below shows how important the skin is in controlling the core body temperature in very warm conditions. On a hot day, the hypothalamus is stimulated and sends impulses to the blood vessels More sweat is released. Evaporation of the sweat cools the skin. Sweat gland becomes more active. Blood vessels dilate (become wider). This is called vasodilation. More blood flows to the skin. . More heat is lost from the skin. More blood is sent to the sweat glands. Using the information provided draw your own picture, alongside the one given, showing how the skin controls body temperature in cooler conditions. (5) (14) TOTAL QUESTION 1: (20)

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter37: Maintaining The Internal Environment

Section: Chapter Questions

Problem 9SA

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Low levels of Na+ will cause which of thefollowing? ( check all that apply) A. Increased Na+/K+ pump activity inthe distal convoluted tubule. B.Increased release of hormone fromthe adrenal cortex. C. Increased K+ concentration in urine. D. Decreased conversion of Ang I toAng I
Alcohol is identified as a diuretic as it suppresses vasopressin level. Explain why someone who is dehydrated should not be drinking alcohol to hydrate? hint: explain in terms of the hormonal action 12pt v Paragraph V | BI U AV 2 ✓ T² v V | CO v SV Dv
A person has a tumor of the adrenal cortex that hypersecretes aldosterone and is not regulated bythe normal negative feedback controls. What symptoms might this person exhibit and how does thiscondition affect his kidney function? Would he have polyuria?
B. Blood Pressure Homeostasis Use the terms in bulleted list to complete the schematic diagram of blood pressure homeostasis in Figure 29.8. he schema des • ADH • aldosterone • blood pressure bahrloo (std) solo wolno bisow at ang o Stimulation T Short Term Regulation Nervous System HOMEOSTASIS asmal oil widiw boold oili mon atomun Normal BP and volume o to law of nidriw and steam dioome siff& Stimulation of baroreceptors and chemoreceptors TAROT Stimulation of cardiovascular center stimulation Decreased BP and volume Peripheral vasoconstriction blood volume cardiac output mit sympathetic nerves ******** 5. FIGURE 29.8 Blood pressure homeostasis. Renin (kidney) Angiotensin II activation 201 Homeostasis restored bol nalligas ant nidhiw wolf boolll . Long Term Regulation Hormones 6 4 (Posterior pituitary) (Adrenal gland) panio 00018 A Blood pressure Scola ΕΡΟ erythropoietin (kidney) RBC production
. is a hormone that regulatesthe amount of water reabsorbed by thecollecting duct
For this SECTION (#9) Decide how the following conditions would affect the physiology of the Uinary System ADH causes the osmolarity of urine to O Increase O Decrease O Stay the same As filtrate travels from the capsular space to the loop of Henle, its glucose content will O Increase Decrease Stay the same
The following events occur when the body loses water by sweating.I - Hypothalamus stimulates the posterior pituitary glandII - Osmotic pressure of blood stabilizesIII - ADH causes kidneys to reabsorb more waterIV - Osmotic pressure of blood increases In what order do these events occur?
Drugs that increase urine flow (diuretic drugs) are oftenemployed in the treatment of hypertension (high blood pressure)or other disease states. Three physiological categories of suchdrugs are ones that (i) function as loop diuretics, (ii) inhibitthe action of aldosterone, and (iii) block Na+ channels in thecollecting ducts. Explain why each of these categories wouldbe expected to increase Na+ excretion and urine flow. (Hint:Rereading the section on hormones at the end of Chapter 28might prove helpful.)
Sabrina Hernandez had a road accident in which she bled profusely and her blood pressure dropped. What are the mechanisms by whic her body will compensate? Check all that apply. OIncreased ADH O Increased heart rate OVasodilation O Vasoconstriction O Increased Aldosterone
elo urine production and decreasing blood volume and pressure. Show this process by adding ARROWS to the diagram below: ing om be vol VERY HIGH 21s bo blood volume or pressure insgovm ndt molgoluduT ortt right Filtration rate and urine production increased blood volume / pressure leJe restored! noitns Atrial (heart) wall stretches (eealyeoM CLOunst A915 00shuae nous o Atrial Natriuretic Peptide (ANP; hormone) released HICH PIOOG P. boc br noitsu bis bl sts ob sansb slussM (ofo soio) wol taa lo eleval TOO slunsig Learateg Granular cells Mesangial cells relax & glomerulus expands inaieltA (eno eloio) otni ewolt bo aulunemoig Stop Stop releasing contracting - afferent arteriole renin iun expands 2bonegno 2sione ns) anoiti noo JAEUMU 1ebaU
Describe the homeostatic mechanisms that Lacy's body would use to counteract the water deficit
Some tumors of the brain, pancreas, and small intestinesecrete ADH. What type of fluid imbalance would thisproduce? Explain why