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Coordination and Response (The organs of homeostasis (Definitions…
Coordination and Response
The organs of homeostasis
Brain = controls lots of hormeostasis activities
Lung = excreting CO2 ensuring enough O2
Pancreas = Regulate blood glucose
Kidney = regulates water content and excretes uria
Skin = regulates body temperature, water content and salt levels
Definitions
Homeostasis = maintaining a constant internal environment
Negative feedback = When the body responds to a change
Excretion = the removal of toxic waste
Water is controlled by skin and kidneys
Salt is controlled by skin and kidneys
Temperature is controlled by skin
Sugar is controlled by pancreas
Carbon dioxide controlled by lungs
Homeostasis in plants
plants work best if they have the optimum: temperature, water levels, and ion concentration
Co2 diffuses into the leaf through the stomata
Guard cells regulate the opening and closing of the stomata
Photosynthesis waste = oxygen
Mesophyll layer increases the rate of diffusion
The kidney
The kidney excretes urea and water, regulates water content
Urine = a solution that contains water, urea and salts
Urea = a waste product that the body makes when breaking down excess protein. Toxic
Glomerular Filtrate = the liquid enters the Bowman's capsule, it has come out of the glomerulus
Nephron and Osmoregulation
Ultrafiltration
Blood from renal artery flows through the glomerulus
High pressure is built up which squeezes water, urea, salts and glucose out of the blood into the Bowman's capsule
Reabsorption
All glucose is reabsorbed from the proximal convoluted tubule. Active transport
Suffiecient salt is reabsorbed
Suffiecent water is reabsorbed from the collecting duct into the blood stream
Osmoregulation
ADH makes collecting duct highly permeable in water
