1. Frog Lab Preview

3. Frog External Features:
Frog skin
Smooth and moist
Takes in oxygen
Absorbs water through the skin and can also lose water through skin.
Eyes
Sight – 3 lids, 2 are upper and lower (color of skin), 1 is transparent.
Retract in head to help push food down
Nostril – Smell only, can not use for breathing.
Tympannum – (eardrum) for hearing
Mouth – large, has vomerine teeth.
Front legs
Digits not webbed
Used for grasping
Hind legs
Powerful muscles for jumping
Digits webbed for swimming

4. Frog Body Systems
Circulatory System – How the blood circulates through the body.
Heart - RED – pumps blood.
Blood Vessels
Artery – RED – carries blood from the heart to the body.
Oxygen rich blood.
Vein – BLUE – carries blood from the body to the heart.
Oxygen poor blood.
Spleen – BROWN – has a few jobs
associated with specific blood cells.

5. Frog Body Systems Respiratory System – How the frog breathes.
Lungs – PINK / PURPLE – Used to take in oxygen while on land.
Skin – Used to take in oxygen while in water.
Nervous System – How the frog senses and feels things.
Brain – Enclosed in the skull.
Spinal Cord – Enclosed in the spine.

6. Frog Body Systems Reproductive System – Making more frogs. Male –
Testis – make sperm
Sperm Duct
Cloaca
Female –
Ovary – make eggs
Oviduct
** Eggs may be visible in a female frog during
dissections.
Testis

7. Frog Body Systems Reproductive System – Making more frogs. Female –
Ovary – make eggs
Oviduct
Cloaca
** Eggs may be visible in a female frog during
dissections.
Oviduct
Eggs

8. Frog Body Systems
Digestive System – Taking in food and breaking it down.
Mouth – takes in food; anterior end.
Pharynx - BEIGE – muscular tube leading to the esophagus.
Esophagus – BEIGE – tube going from the pharynx to the stomach.
Stomach – BEIGE – stores food.
Small Intestine – BEIGE – main organ in
digestion.
Large Intestine – BEIGE – Absorbs water
and stores wastes.
Cloaca – releases wastes.

9. Frog Body Systems
Digestive System – Other structures to help break down food.
Liver – BLUE – 3 large lobes that produce a substance called bile.
Bile helps to digest fats.
Gallbladder – LIGHT GREEN – stores bile. On the underside of the liver.
Pancreas – YELLOW – produces enzymes for digestion. This is hard to find.

10. Frog Body Systems
Urinary System – Filters excess water and toxins out of body.
Kidneys – BROWN / BLUE – Remove wastes from the blood. This also excretes urine.
Bladder – BEIGE – Stores urine.
Cloaca – Urine exits the body.
Excretory System – Gets rid of wastes.
Cloaca – means sewer. This is where the
waste, urine, sperm and eggs exit
the body.
Other Structures
Fat Bodies – YELLOW / GREEN – Helps
insulate frog.