The document discusses the process of eliminating urine from the body. Urine is formed in the nephrons of the kidneys through filtration and reabsorption processes. The urine then travels from the kidneys through the ureters to the bladder, and is eventually released outside the body through the urethra.

1. Process of Eliminating Urine
Science V

2. What are the structure and functions of
the following parts:
a. Ureter d. Bladder
b. Nephron e. Urethra
c. Glomerulus f. Kidney
Review

3. 1. Do most people have two (2) kidneys?
2. Can a person live normally with only
one kidney?
3. What is the function of the kidney?
4. What part of the urinary system stores
urine?
Checking of Assignment

4. How often do you urinate?
What do you think makes you feel
urinating?
Does it do something good for your body?
Motivation

5. Presentation
Watch the Video Clip
Urine Formation
by
Alejandra Cork

6. Concept Formation
The formation of urine by the nephrons
takes place in two stages: filtration and
reabsorption.
In filtration, substances pass from the
blood into the nephrons.
In reabsorption, substances pass out of
the nephron and back into the blood.

7. Concept Formation
Filtration and Reabsorption

8. Motivation
Filtration occurs
while the blood is
flowing through the
glomerulus within
Bowman’s capsule.
The fluid in Bowman’s capsule is called
filtrate and it passes into the tubules of the
nephrons.

9. Motivation
Reabsorption occurs
in the tubular parts
of the nephron
where water and
solutes move across
the tubular wall out of the nephron by
diffusion and into the surrounding
capillaries.

10. Motivation
Secretion moves
substances from
capillaries to the
nephron walls.
Capillaries secrete
excess amounts of hydrogen and
potassium ions into the nephron tubules.

11. Concept Formation
The renal pelvis sends the fluid
remaining in the nephrons consisting
mostly of water, urea, and various salts,
now known collectively as urine, away
from the kidney via the ureter, then into
the urinary bladder. This urinary bladder
sends nerve impulses to the brain when
full. From here, urine is eliminated through
the urethra and out of the body.

12. Application
Explain
through the
diagram
the three
processes
involved in
urine
formation.

13. Evaluation
Number the process of eliminating from 1-5.
__ Capillaries secrete excess amounts of
hydrogen and potassium
__ The blood containing wastes enters the
kidney via renal artery
__ From the bladder, the urine is eliminated
through the urethra
__ Urinary bladder expands and sends nerve
impulses to the brain when full
__ Reabsorption occurs in the tubular parts of
the nephron

14. Evaluation
Number the process of eliminating from 1-5.
3 Capillaries secrete excess amounts of
hydrogen and potassium
1 The blood containing wastes enters the
kidney via renal artery
5 From the bladder, the urine is eliminated
through the urethra
4 Urinary bladder expands and sends nerve
impulses to the brain when full
2 Reabsorption occurs in the tubular parts of
the nephron

15. Assignment
1. Ask your mother or a doctor or a nurse,
why most children urinate more often on
cold days than on warm days?
2. Drink eight (8) glasses of water before-''
going to bed. Observe and count how
many times you urinated during the night.