Khan Excretory #1 PDF

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Name: Jordan Robinson

Due by Thurs 4/2

Khan Academy: https://www.khanacademy.org/partner-content/crash-course1/partner-topic-crash-course-bioecology/crash-course-biology/v/crash-course-biology-128 Excretory System: Heart to Toilet (11:45) 1) What four parts make up the excretory system? a.

Kidneys

b.

Ureter

c.

Bladder

d.

Urethra

2) What is osmoregulation? maintaining the right levels of water and dissolved substances in your body, how our body gets rid of the stuff we don’t need like byproducts and metabolism food while also making sure the body doesn’t get dehydrated.

3) What byproduct comes from breaking down protein? Ammonia

4) What byproduct do humans excrete? Urea

5) What two main functions do kidneys do? a.

maintain levels of water and dissolved materials

b.

control blood pressure

6) How many liters do your kidneys filter out throughout the day and how does that compare to the amount that is excreted? a.

180 liters a day

b.

excrete 1.5 liters a day

7) What is most of the excretory system dedicated to doing? reabsorbing 8) What are nephrons and how many are found in each kidney?

a.

network of tiny filtering structures

b.

a million

9) How does the blood from the heart get to the kidneys? renal arteries

10) What is the starting point in the nephron? glomerulus

11) What is filtrate and where does it go? a.

fluid that gets squeezed out of the blood: made up of water, urea, some smaller ions and molecules

b.

goes from Bowman’s capsule into proximal convoluted tubules to loop henle

12) What molecules does your body need? glucose, amino acids, sodium, potassium, water

13) What are the two main parts of the kidney discussed in this video? a.

renal cortex

b.

renal medulla

14) Where does most of the reabsorption take place? in the loop of Henle

15) What three things does the Loop of Henle do? a. extracts water b. pumps out salts we wanna keep on the way back to the cortex c. it makes the medulla hypertonic

16) How does osmosis relate to what happens in the nephron? you know that as the filtrate moves along it loses more and more water through the membrane, by the time the filtrate gets to the bottom of the loop, it's highly concentrated.

17) What gets filtered out and ends in the bladder and how does it get there? a.

urine

b.

ureter tubes

18) What tube allows urine to leave the body? urethra...