Transcript Earthworm Lab Preview

Frog Lab Preview
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Frog External Features:
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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
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Frog Body Systems
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Circulatory System – How the blood circulates through the body.
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Heart - RED – pumps blood.
Blood Vessels
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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.
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Frog Body Systems
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Respiratory System – How the frog breathes.
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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.
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Brain – Enclosed in the skull.
Spinal Cord – Enclosed in the spine.
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Frog Body Systems
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Reproductive System – Making more frogs.
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Male –
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Testis – make sperm
Sperm Duct
Cloaca
Testis
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Female –
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Ovary – make eggs
Oviduct
Cloaca
** Eggs may be visible in a female frog during
dissections.
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Frog Body Systems
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Reproductive System – Making more frogs.
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Female –
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Ovary – make eggs
Oviduct
Cloaca
** Eggs may be visible in a female frog during
dissections.
Oviduct
Eggs
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Frog Body Systems
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Digestive System – Taking in food and breaking it down.
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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.
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Frog Body Systems
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Digestive System – Other structures to help break down food.
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Liver – BLUE – 3 large lobes that produce a substance called bile.
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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.
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Frog Body Systems
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Urinary System – Filters excess water and toxins out of body.
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Excretory System – Gets rid of wastes.
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Kidneys – BROWN / BLUE – Remove wastes from the blood. This also
excretes urine.
Bladder – BEIGE – Stores urine.
Cloaca – Urine exits the body.
Cloaca – means sewer. This is where the
waste, urine, sperm and eggs exit
the body.
Other Structures
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Fat Bodies – YELLOW / GREEN – Helps
insulate frog.