LABORATORY GUIDE
NATURAL SCIENCE AND ENVIRONMENTAL
EDUCATION DEPARTMENT
GIMNASIO LOS PINOS
Elaboro: Jefe Ciencias
Aprobó: Dir SGC
Fecha de
emisión:
9-Jun-10
Código:
GCU-LAB-03
Versión.1
Página 1 de 3
LABORATORY GUIDE
No. 2.2
PRACTICE NAME
TEACHER: ____________________________________________ GRADE: _____ DATE: ____________
GROUP NAMES:
OBJETIVE:

Recognize the main organ of the excretory system, its parts and functions.
THEORETICAL FRAMEWORK:
Parts of the Excretory System
Skin- this organ is part of both the excretory system and the integumentary
system to produce sweat. The sweat takes out the dead skin cells and bacteria
in the pores to keep the skin healthy.
Lungs- these 2 organs in the body take in oxygen from the air we breathe and
put that oxygen in the blood and, at the same time, the blood in the body
exchanges the oxygen for carbon dioxide.(CO2)
Liver- this organ creates essential nutrients for the other organs and put special
chemicals in the blood to clean it, while the used chemicals go to
the kidneys to be taken to the bladder
Kidneys-these organs in the body take in extra water and waste to be put
through the ureter(see image B) and be stored in the urinary bladder to be
taken out the body by urination( in other words- bathroom time!)
Bladder/ Urinary bladder- this is the storage place of the extra water and waste
sent by the kidneys to be taken out the system by urination through the urethra
Image A
Ureter- these parts of the excretory system are connected from
thekidneys(see image A)to the urinary bladder(see Image A). This
transports the waste from the kidneys to the bladder for storage.
Urethra- this part of the body takes urine from the bladder(see image
A) out of the system
Image B

Basic Kidney Anatomy
There are three primary components to a kidney:
1.
Renal Capsule: A smooth semitransparent membrane that adheres tightly to the outer surface of the kidney.
2.
Renal Cortex: The region of the kidney just below the capsule. In a fresh kidney the colour of the cortex will
be reddish brown.
3. Renal Medulla: The region deeper into the kidney, beneath the cortex layer. In a fresh kidney it is redder in
coIour than the cortex. It is segregated into triangular and columnar regions. The triangular regions are the
renal pyramids, which should be striated (or striped) in appearance due to the collecting ducts running
through them. The columnar regions between the pyramids are the renal columns. These renal columns are
where the interlobar arteries are located.
LABORATORY GUIDE
NATURAL SCIENCE AND ENVIRONMENTAL
EDUCATION DEPARTMENT
GIMNASIO LOS PINOS
Elaboro: Jefe Ciencias
Aprobó: Dir SGC
Fecha de
emisión:
9-Jun-10
Código:
GCU-LAB-03
Versión.1
Página 2 de 3
MATERIALS:


Lamb
frozen

Camera

Red plastic bag
kidney
Dissection
kit
(knife – dissection
board)

1/8
cardboard
(Flags - labels)

Pins

Towel
Goggles

Gloves
Liquid soap

Lab coat

Surgical face mask


PROCESS:
Activity 1:
1. Follow the instructions in this dissection guide to identify all the structures in the kidney.
2. Collect dissecting tools, a ruler and a tray for your lab group. Obtain a fresh lamb kidney, it must be frozen.
3. Observe carefully the kidney, identify what you are seeing.
4. Take the kidney and lay it flat on your dissection board.
5. Continue with the following specific steps.
1. Observe in detail the kidney.
2. Identify the following parts.
3.Handle sharp instruments with caution. Always point 4. Call to your teacher and cut the kidney in half longitudinally
them and cut away from yourself and anyone else who is using the knife or with short repeated strokes of the scalpel. DO
nearby.
IT WHEN YOUR TEACHER IS PRESENT, WITH YOU
5. Examine the interior structure of the kidney. Identify the
cortex, medulla, pelvis, ureter, nephrons and any blood vessels
present (renal vein / renal artery).
6. Complete a biological drawing of the interior of one half of the
kidney, or take some pictures with your camera.
7.Use pins and the labels provided to make small flags to
. Dispose of the kidney in the waste bag provided. Wash all
indicate the following structures:Renal vein, medulla,
dissecting equipment and return. Wash your hand thoroughly
cortex, renal artery, ureter and Nephrons
with warm soap and water
LABORATORY GUIDE
NATURAL SCIENCE AND ENVIRONMENTAL
EDUCATION DEPARTMENT
GIMNASIO LOS PINOS
Elaboro: Jefe Ciencias
Aprobó: Dir SGC
Fecha de
emisión:
9-Jun-10
Código:
GCU-LAB-03
Versión.1
Página 3 de 3
COLLATED DATA:
Questions
1. Measure the kidney:
Length:
_cm
Width:
_cm
2. 2. It should be possible to identify three tubes entering or leaving the kidney. What are these called? (3 marks)
_______________________________________________________________________________________________
_______________________________________________________________________________________________
___________________________________________________________________________________
3. Take a photo.
BIBLIOGRAPHY.



http://www.scienceteacherprogram.org/pdf/JBader11KidneyDissectionGuide.pdf
http://www.abpischools.org.uk/page/modules/homeostasis_kidneys/kidneys2.cfm?coSiteNavigation_allTopic=1
http://excretorysystemmiguel.weebly.com/diagrams.html