Excretion (chpt. 31) Flashcards
Excretion
The removal of metabolic waste from the body
Excretory organ in plants
Leaves - through stomata
Vasoconstriction
When we are COLD, blood vessels contract and reduce blood flow to capillaries near the surface
Vasodilation
When we are WARM, blood vessels dilate and increase blood flow near the surface of the skin to increase heat loss
Role of the skin
- Protection (epidermis, melanin, sebum)
- Vitamin Production (vitamin D)
- Food store (fat)
- Sense organ (touch, pain, temperature)
- Excretion (sweat)
- Temperature regulation
Excretory organs in humans
Skin
Lungs
Kidneys
What is excreted by the lungs
Carbon dioxide
What is excreted by the skin
Sweat (water, salts, urea)
Where are the kidneys located in an adult human
Lower abdomen
Location of filtration in the nephron
Bowman’s capsule
Location of re absorption in the nephron
Proximal convoluted tubule
(Or DCT , loop of Henle)
Name the arteriole that enters bowman’s capsule
Afferent arteriole
Structural differences between Afferent and Efferent arteriole & significance of difference
Efferent has a narrow lumen, increases blood pressure
Why would prolonged strenuous exercise lead to production of ADH
Low water content in blood
What part of the nephron is influenced by ADH
Collecting duct
