Biology -Homeostasis questions

Questions and Answers on Homeostasis: Lungs, Kidneys and excretion.

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  • Created by: H Burton
  • Created on: 14-03-11 16:16

Homeostasis

Define "Homeostasis"

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Homestasis

Process of the body adapting to changes in the enviroment so the body's most efficiant internal enviroment is sustained

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Homeostasis

 

State 3 internal conditions in which the body must be maintained

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Homeostasis

-Temperature
-Sugar level
-Water Level

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Homeostasis

What is removed from the body via the lungs?

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Homeostasis

Carbon dioxide

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Homeostasis

 

 

 

List Four ways the lungs have adapted to allow them
 to loose Carbon dioxide and how.

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Homeostasis

-Many Alveoli (Larger surface area)

-Thin membrane between alveoli wall and blood capillaries (shorter diffusion difference)

-Many Blood Capillaries (transports carbon dioxides from body tissues)

-The lung is connected to a tree like system of tubes ;the trachea, bronchi and bronchioles. (removes the carbon dioxide from the lungs)

 

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Homeostasis

 

 

State the process by which carbon dioxide leaves the blood to move into the alveolus

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Homeostasis

Carbon Dioxide leaves the blood by diffusion

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Homeostasis

 

 

Name three things that the kidney removes from
the body

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Homeostasis

-Excess water
-Urea
-Excess Salt

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Homeostasis

 

 

Name the organ where most urea is produced

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Homeostasis

Urea is the breakdown of amino acids by the liver

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Homeostasis

 

 

Explain Why is is necessary to balance our water content

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Homeostasis

Water loss must equal water intake
too prevent Dehydration

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Homeostasis

Balanced equation for AEROBIC respiration

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Homeostasis

 

 

C₆H₂+ 6O₂--> 6CO₂+ 6H0 + Energy

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Homeostasis

(http://img833.imageshack.us/img833/7285/kidneylongitudinal.png)

 Label the cortex, medulla, pyramids, renal artery, renal vein, urether, Calyx and Renal pelvis

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Homeostasis

a -  Medulla Pyramid
b- Calyx
c- Renal Artery
d- Renal Vein
e- Renal Pelvis
f- ureter
g- Renal Capsule
h-  Cortex
i - Renal Column

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Homeostasis

a = Glomerulus
b= bowmans capsule
c= Proximal convoltued tubule (PCT)
d= Distal convoluted tubule (DCT)
e= collecting duct
f= to ureter
h= loop of henle

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(http://kcfac.kilgore.cc.tx.us/mobleypageap1/images/nephron1.1web.jpg)

Label: loop of henle, Glomerulus, Proximal Convoluted tubule (PCT), Distal convoluted tubule (DCT), collecting duct, to ureter. [ignore i and g]

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Homeostasis

Explain why the process by which water and small soluble molecules are forced out of the glomerulus is called ultra filtration

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Homestasis

Only Certain sized molecules can pass through the semi permeable membrane e.g urea and water.

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Homeostasis

Explain where the pressure, which provides the force for ultrafiltration, is generated

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Homeostasis

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Homeostasis

List Four substances that are lost from the blood by ultrafiltration

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Homeostasis

- Salt
-Urea
-Water
-Glucose

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Homeostasis

List two things that are not lost and explain why they remain in the blood

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Homeostasis

- Cells (the body needs these)
- Protein (the body needs this)

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Homeostasis

Explain what, under normal circumstances, happends to all the glucose that leaves the blood and where this happens.

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Homeostasis

Glucose is reabsorbed in the Proximal conveluted tubule after ultrafiltration

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Homeostasis

State what happens to the salt after leaving the blood

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Homeostasis

The salt leaves the nefron via the the collecing duct

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Homeostasis

State how urea leaves the Nephron

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Homeostasis

Salt leaves the nephron via the collecting duct

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Homeostasis

List three ways the body gains water

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Homeostasis

 

 

-drinking
-tissue respiration
-water content in food

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Homeostasis

List 6 ways in which the body looses water

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Homeostasis

-urination
-Sweat
-exhaling in air
-vomitting
-in faeces
-by exaporation of moist surgaces (e.g cornea on eye)

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Homeostasis

Explain why the water content of the body must be maintained within a narrow range of concentrations

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Homeostasis

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Homeostasis

Explain the role of the loop of Henle and collecting duct in regulating water content

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Homeostasis

Water is reabsorbed at the loop of henle and at the collecting duct

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Homeostasis

What does ADH stand for?

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Homeostasis

Antidiuretic Hormone

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Homeostasis

 

 

Where is ADH produced?

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Homeostasis

ADH is produced in the priturity gland which is found in the brain

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Homeostasis

Describe the body conditions which would lead to increased ADH Production

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Homeostasis

If the blood is very concentrated the piturity gland produces ADH

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Homeostasis

What does the presence of ADH in the blood do to the loop of henle and collecting duct wall? and what this does to the amount of water reabsorbed?

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Homeostasis

The Loop Henle and collecting duct reabsorb MORE water if ADH is present in the blood

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Homeostasis

Using the idea of osmosis, explain why water leaves the tubule when its permeability increases

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Homeostasis

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Comments

1234

That seems hard for GCSE...

Kay

Very useful cards! I liked the layout and it's helped remember key facts :) 5/5

Swallowtail

A well thought out set of cards covering homeostasis.Each question asked has the answer on the next card which means you can easily use them to test your knowledge of this topic.

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