The Kidneys And The Excretory System - Part 3 (T2) Flashcards Preview

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Flashcards in The Kidneys And The Excretory System - Part 3 (T2) Deck (10):
1

Name the six main areas of the nephron...

- bowman's capsule - glomerulus

- collecting duct

- blood capillaries

- convoluted tubules

- loop of henle

2

Summarise the process of the nephron in three points...

- filtration: lots of water, ions, urea and sugar are squeezed from the blood into the tubules

- selective reabsorption: ions and sugars are reabsorbed back into the blood from the tubules and the amount of water in the blood is regulated at a constant rate

- excretion of waste: urea, excess water and ions travel to the bladder as urine

3

What is osmoregulation?

It is the regulation of water in the blood in the kidneys, keeping it at a constant rate

4

What hormone controls the kidneys and the concentration of urine within them?

- ADH (anti-diuretic hormone)

- this is produced by the pituitary gland

5

If water concentration in the kidneys falls, what happens?

- more ADH is produced

- the kidney absorbs more water

- a small volume of very concentrated urine is produced, reducing water loss

6

If water concentration in the kidneys rises, what happens?

- less ADH is produced

- the kidney absorbs less water

- a large volume of very dilute urine is produced

- this increases water loss

7

What is meant by the term 'negative feedback mechanism'?

When a substance is produced in our bodies to return a system to normal

8

How is ADH an example of a negative feedback mechanism?

ADH is produced in response to low blood water levels

9

What is the darker outer region of the kidney called?

The cortex

10

What does the cortex contain?

- tiny blood vessels that branch off from the renal artery

- microscopic tubes and filtering units known as kidney tubules or nephrons

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