3Frog External Features: Frog skinSmooth and moistTakes in oxygenAbsorbs water through the skin and can also lose water through skin.EyesSight – 3 lids, 2 are upper and lower (color of skin), 1 is transparent.Retract in head to help push food downNostril – Smell only, can not use for breathing.Tympannum – (eardrum) for hearingMouth – large, has vomerine teeth.Front legsDigits not webbedUsed for graspingHind legsPowerful muscles for jumpingDigits webbed for swimming
4Frog Body SystemsCirculatory System – How the blood circulates through the body.Heart - RED – pumps blood.Blood VesselsArtery – 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 jobsassociated with specific blood cells.
5Frog 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.
6Frog Body Systems Reproductive System – Making more frogs. Male – Testis – make spermSperm DuctCloacaFemale –Ovary – make eggsOviduct** Eggs may be visible in a female frog duringdissections.Testis
7Frog Body Systems Reproductive System – Making more frogs. Female – Ovary – make eggsOviductCloaca** Eggs may be visible in a female frog duringdissections.OviductEggs
8Frog Body SystemsDigestive 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 indigestion.Large Intestine – BEIGE – Absorbs waterand stores wastes.Cloaca – releases wastes.
9Frog Body SystemsDigestive 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.
10Frog Body SystemsUrinary 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 thewaste, urine, sperm and eggs exitthe body.Other StructuresFat Bodies – YELLOW / GREEN – Helpsinsulate frog.