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RAT DISSECTION Image from: http://www.animationlibrary.com.

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Presentation on theme: "RAT DISSECTION Image from: http://www.animationlibrary.com."— Presentation transcript:

1 RAT DISSECTION Image from:

2 Mammals lived at same time as dinosaurs; mammals spread out when dinosaurs became extinct

3 RAT ANIMALIA CHORDATA VERTEBRATA “backbone” Mammalia “breast”
LATIN meaning KINGDOM _____________ PHYLUM ____________________________ SUBPHYLUM ___________________________ CLASS _______________________________ ORDER _____________________________ ANIMALIA CHORDATA VERTEBRATA “backbone” Mammalia “breast” RODENTIA “to gnaw”

4 Hair or Fur Provides insulation (hold in body heat) Identification
Hair or Fur Provides insulation (hold in body heat) Identification Camouflage

5 VIBRISSAE Nictitating membrane missing EXTERNAL NARES Image by
Riedell/VanderWal © 2005 VIBRISSAE EXTERNAL NARES

6 SPECIALIZED TEETH (Different shapes)
Image by Riedell/VanderWal © 2005 SPECIALIZED TEETH (Different shapes) 2 pairs of CONTINUOUSLY GROWING INCISORS

7 PINNA Catches sound Tympanic membrane (eardrum) inside ear opening
Image by Riedell/VanderWal © 2005

8 MAMMARY GLANDS Modified sweat glands Males are non-functional
Have nipples but don’t have right hormones to make milk

9 EXIT OPENINGS Separate exit for feces = anus

10 FEMALES have 3 Exit openings
Image by Riedell/VanderWal©2005 FEMALES have 3 Exit openings

11 MALES have 2 Exit openings ANUS UROGENITAL (Excretory & Reproductive share)
Image by Riedell/VanderWal©2005

12 TESTES outside body in SCROTUM Need to be cooler than body temperature to make sperm
Image by Riedell/VanderWal©2005

13 Image by Riedell/VanderWal©2005

14 DIAPHRAGM Image by Riedell/VanderWal©2005

15 DIAPHRAGM Contracts to pull in air Divides coelom into:
Image by Riedell/VanderWal©2005 Contracts to pull in air Divides coelom into: THORACIC CAVITY heart & lungs ABDOMINAL CAVITY digestive, excretory, reproductive organs

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17 SPLEEN Peeks out from behind stomach
Makes, stores, and processes blood cells Image by Riedell/VanderWal © 2005

18 PANCREAS Makes TRYPSIN digest proteins Makes INSULIN
(In mesentery next to duodenum) Makes TRYPSIN digest proteins Makes INSULIN tells cells to store blood glucose as glycogen Makes GLUCAGON tells cells to release stored glycogen into bloodstream as glucose Image by Riedell/VanderWal © 2005

19 MESENTERY Image by Riedell/VanderWal©2005

20 Image by Riedell/VanderWal©2005
Stomach

21 STOMACH - Add acid/grind & mash food SMALL INTESTINE: DUODENUM- Add trypsin (digest proteins) & bile (digest fat) JEJUNUM- Finish digestion/absorb nutrients ILEUM- CECUM- “J” Pouch at junction of small and large intestine Contain bacteria to digest plant material

22 LARGE INTESTINE- Collect & Concentrate digestive waste absorb water back from feces RECTUM- Last part of Large intestine Stores feces waiting to exit ANUS Exit opening for digestive waste only

23 Human small intestine = about 22 feet long
DID YOU KNOW? Human small intestine = about 22 feet long Human large intestine = 5 feet long Food can spend as long as 4 hours in the small intestine

24 TRACHEA Cartilage rings keep airway open
Image by Riedell/VanderWal © 20075

25 Lungs Left side of heart is larger- Pumps blood to entire body
Image by Riedell/VanderWal©2005 Left side of heart is larger- Pumps blood to entire body So lungs on that side are smaller

26 4 chamber heart/2 loops Image by Riedell/VanderWal©2005

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28 BIRD & MAMMAL CIRCULATION
Body organs Lungs RIGHTAtrium LEFT Atrium   Right Ventricle Left Ventricle BIRD & MAMMAL CIRCULATION 4 chambers/2 loops

29 Make digestive enzymes
Image by Riedell/VanderWal©2005 SALIVARY GLANDS Make digestive enzymes AMYLASE starts digesting complex carbohydrates (starch) in mouth

30 SEMINAL VESICLES- Store sperm Add fluids VAS DEFERENS- Carry sperm to
EPIDIDYMIS- Mature sperm Add tails TESTES- Make sperm Image by Riedell/VanderWal © 2005

31 Baby grows inside mom nourished by placenta
Image by Riedell/VanderWal © 2005 OVARY- Makes eggs OVIDUCT- Carries eggs to uterus UTERUS- place where baby grows VAGINA- Exit for baby VIVIPARITY- Baby grows inside mom nourished by placenta

32 Image by Riedell/VanderWal © 2005

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34 KIDNEYS Excrete nitrogen waste Osmoregulation
Image by Riedell/VanderWal © 2005

35 URINARY BLADDER Image by Riedell/VanderWal © 2005

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