Wednesday, May 28, 2014

Dissection Lab

Grasshopper

Grasshopper Dissection Video


Heart
The heart is separated into different ventricles, valves and atria to pump blood through the body of the grasshopper

Crop
A pouch in many birds and some lower animals that resembles a stomach for storage and preliminary maceration of food

Gastric Caecae
The gastric caecae are long fingery glands next to the gizzard and the stomach of a grasshopper that secrete enzymes that aid in digestion

Intestine
It absorbs water and compacts waste. It also Transports waste from the stomach to the rectum.



Frog

Frog Dissection Video

Vomerine/maxillary teeth- teeth for holding prey

Tongue- attached in front. Brings food to the back of the mouth

Glottis- opening in back if the mouth. Leads to trachea then the lungs

Gullet- large opening in back of mouth. Leads to the stomach

Esophagus- tube like structure from mouth to stomach

Stomach- breaks down food

Small intestine- more digestion and absorption of nutrients

Liver- produces bile to break down fats, store glucose, and detoxify

Gallbladder- stores bile

Cloaca- an opening on the outside of the body that waste and reproductive cells pass through as they exit the body

Pancreas- produces hormones and digestive enzymes

Large intestine- reabsorbing of water into the bloodstream

Spleen- stores, produces and removes RBC's from blood

Oviducts-transports eggs to the cloaca

Fat bodies- stores fat used in metamorphosis of hibernation

Kidney- filters waste and toxins from the blood

Urinary bladder- stores liquid waste from the kidney

Lung- allows exchange of oxygen and carbon dioxide

Ventricle- lower pumping chamber of the heart

Atrium- upper receiving chamber of the heart

Bone- support

Eggs- female reproductive gametes

Testes- male reproductive gonads



Earthworm

Earthworm Dissection Video


Pharynx
Muscular apparatus to suck up food that is in soil

Gizzard
Food is forced from the crop, and grains of sand grind up the food in the digestive system

Seminal receptacles
Stores sperm from another worm

Seminal vesicles
Extend from the testis sacs and stores sperm produced by two pairs of testes within the sacs

Crop
Thin wall organ that acts as a temporary storage place for food

Heart
5 aortic arches that connect the dorsal and ventral blood vessels to pump blood through the body of the worm

Mouth
Muscular pharynx used to feed

Metameres (segments)
Rings on the outer part of the worm that individualize parts of the worm so the worm can still function as normal if a segment is damaged

Anus
Located on the opposite end of the worm from the mouth, it's a small opening of the intestines to release waste

Dorsal Blood Vessel
Tube that extends the length of the body. It is contractile and pushes blood forward in the earthworm and is pumped into the aortic arches

Ventral Blood Vessel
Tube that extends the length of the body. It pumps blood away from the heart towards the posterior end

Intestine
Extends from stomach as the digestive track where the enzymes break down the food and the blood of the intestine wall absorbs the nutrients



Starfish

Starfish Dissection Video


Pedicellaria 
Function: Claw type structures that are thought to help in the cleanliness of the star fish 

Madreporite
Function: Filter water into the water vascular system 

Digestive Glands 
Function: Break down food 

Spine
Function: Protection, especially tube feet, and the spinal nerves 

Tube Feet
Function: Used for feeding, movement, and respiration 

Pyloric Stomach 
Function: Breaks down food with the help of enzymes 

Cardiac Stomach
Function: Comes put of the mouth to digest nutrients 

Gonads
Function: Used in reproduction 

Ampulla 
Function: Fill with water and force into tube feet to create movement 

Ambulacral Plates 
Function: Contains the tube feet and is used to pry open shells 

Ring Canal
Function: Carries water from the stone canal to the radial canal

Radial Canal
Function: Takes water out to the arms from the ring canal towards the ampullae 



Perch

Perch Dissection Video


Gills
Organ used for oxygen exchange with the water

Intestine
It absorbs nutrients from waste.

Kidney
Filters waste from blood

Liver
Excretes digestive enzymes and other digestive functions.

Spleen
Produces and stores red blood cells.

Heart
Pumps blood to different parts of the fish.

Swim or air bladder
Closed sac that secretes and absorbs oxygen that maintains the fish at a pressure level.

Stomach
Food is digested and processed.






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