Biology -Homeostasis questions
Questions and Answers on Homeostasis: Lungs, Kidneys and excretion.
- Created by: H Burton
- Created on: 14-03-11 16:16
Homeostasis
Define "Homeostasis"
Homestasis
Process of the body adapting to changes in the enviroment so the body's most efficiant internal enviroment is sustained
Homeostasis
State 3 internal conditions in which the body must be maintained
Homeostasis
-Temperature
-Sugar level
-Water Level
Homeostasis
What is removed from the body via the lungs?
Homeostasis
Carbon dioxide
Homeostasis
List Four ways the lungs have adapted to allow them
to loose Carbon dioxide and how.
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)
Homeostasis
State the process by which carbon dioxide leaves the blood to move into the alveolus
Homeostasis
Carbon Dioxide leaves the blood by diffusion
Homeostasis
Name three things that the kidney removes from
the body
Homeostasis
-Excess water
-Urea
-Excess Salt
Homeostasis
Name the organ where most urea is produced
Homeostasis
Urea is the breakdown of amino acids by the liver
Homeostasis
Explain Why is is necessary to balance our water content
Homeostasis
Water loss must equal water intake
too prevent Dehydration
Homeostasis
Balanced equation for AEROBIC respiration
Homeostasis
C₆H₁₂+ 6O₂--> 6CO₂+ 6H₂0 + Energy
Homeostasis
Label the cortex, medulla, pyramids, renal artery, renal vein, urether, Calyx and Renal pelvis
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
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
Label: loop of henle, Glomerulus, Proximal Convoluted tubule (PCT), Distal convoluted tubule (DCT), collecting duct, to ureter. [ignore i and g]
Homeostasis
Explain why the process by which water and small soluble molecules are forced out of the glomerulus is called ultra filtration
Homestasis
Only Certain sized molecules can pass through the semi permeable membrane e.g urea and water.
Homeostasis
Explain where the pressure, which provides the force for ultrafiltration, is generated
Homeostasis
Homeostasis
List Four substances that are lost from the blood by ultrafiltration
Homeostasis
- Salt
-Urea
-Water
-Glucose
Homeostasis
List two things that are not lost and explain why they remain in the blood
Homeostasis
- Cells (the body needs these)
- Protein (the body needs this)
Homeostasis
Explain what, under normal circumstances, happends to all the glucose that leaves the blood and where this happens.
Homeostasis
Glucose is reabsorbed in the Proximal conveluted tubule after ultrafiltration
Homeostasis
State what happens to the salt after leaving the blood
Homeostasis
The salt leaves the nefron via the the collecing duct
Homeostasis
State how urea leaves the Nephron
Homeostasis
Salt leaves the nephron via the collecting duct
Homeostasis
List three ways the body gains water
Homeostasis
-drinking
-tissue respiration
-water content in food
Homeostasis
List 6 ways in which the body looses water
Homeostasis
-urination
-Sweat
-exhaling in air
-vomitting
-in faeces
-by exaporation of moist surgaces (e.g cornea on eye)
Homeostasis
Explain why the water content of the body must be maintained within a narrow range of concentrations
Homeostasis
Homeostasis
Explain the role of the loop of Henle and collecting duct in regulating water content
Homeostasis
Water is reabsorbed at the loop of henle and at the collecting duct
Homeostasis
What does ADH stand for?
Homeostasis
Antidiuretic Hormone
Homeostasis
Where is ADH produced?
Homeostasis
ADH is produced in the priturity gland which is found in the brain
Homeostasis
Describe the body conditions which would lead to increased ADH Production
Homeostasis
If the blood is very concentrated the piturity gland produces ADH
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?
Homeostasis
The Loop Henle and collecting duct reabsorb MORE water if ADH is present in the blood
Homeostasis
Using the idea of osmosis, explain why water leaves the tubule when its permeability increases
Homeostasis
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