A rat dissection is conducted to explore the internal structure and function of basic mammalian anatomy. The purpose of this exercise is to explore the alimentary canal of the rat and observe the different parts of the digestive system.
What is the largest organ in the rats anatomy and why?
The liver attached to the caudal surface of the diaphragm, is the largest internal organ of the body. It has four lobes, two of which are partially divided. Unlike most mammals, including mice and carnivores, the rat does not have a gal bladder.
What do you learn from a rat dissection?
The rat’s body structure and organ systems are relatively similar to those of a human. This similarity provides an interesting look into mammalian anatomy and allows students to make comparisons between humans, rats, and other mammals.
What is the function of a rat’s liver?
It is just under the diaphragm. The liver has many functions, one of which is to produce bile which aids in the digestion of fats. The liver also stores glycogen and transforms wastes into less harmful substances. Rats do not have a gall bladder (which is used for bile storing in other animals).
What is the position of the rat during dissection?
Get your rat, name it if you wish, and place it on a dissecting tray in supine position. Tie down your rat as directed in your lab sheets. Place your bagged rat in the trays on the back counter. Rinse your dissecting tray and turn it upside down on a towel.
Why do rats often used in dissection?
As a minimum requirement, mice used in experiments must be of the same purebred species. Another reason rodents are used as models in medical testing is that their genetic, biological and behavior characteristics closely resemble those of humans, and many symptoms of human conditions can be replicated in mice and rats. You may also read,
What 5 organs are found in the thoracic cavity of a rat?
- Heart (Ventricles)
- Right Lung.
What are the major organs of the rat?
- Rat External Anatomy.
- The rat’s body is divided into six anatomical regions:
- The Muscular System of the Rat.
- The Skeletal System of the Rat.
- The Digestive System of the Rat.
- The Abdominal Organs.
- Liver. (many lobes) Secum. Spleen. Stomach. Small. Intestine. Small. Intestine. Large. Intestine. Small. …
- Inferior. Vena Cava. Mesentery.
Why does a rat not have a gallbladder?
However, in rats, the cystic duct does not arise from the level of the bifurcated point of the portal vein, and the distal part of the biliary tract enters the liver lobes, as seen in the common hepatic duct in mice (Fig. 2D). Thus, not only the gallbladder but also the cystic duct is com- pletely absent in rats. Read:
What is the largest organ in the body?
The skin is the body’s largest organ.
What organ does a rat not have?
The first part of the small intestines has openings or ducts from different secretory organs, such as the gall bladder and the pancreas. … First, rats do not have a gallbladder. This is because they rarely take in large amount of fatty foods, thereby, making a gallbladder useless.
What are the four bones in the hindlimb of the rat?
What are the four bones in the hindlimb of the rat? femur, patella, tibia, and fibula.
What is the function of the trachea in a rat?
The trachea is responsible for transporting air for respiration from the larynx to the bronchi.
Where does the esophagus lead to in a rat?
The esophagus lies underneath the trachea, though it is easier to locate in the abdominal cavity where it enters the stomach. Locate the larynx, which is just anterior to the trachea. The larynx is the voice box, and it allows rats to making squeaking noises.
What are the features of rat?
General features. Rats are generally slender with a pointed head, large eyes, and prominent, thinly furred ears. They have moderately long legs and long, sharp claws. The bald soles of their narrow hind feet possess fleshy pads of variable size, depending on species.
Which is the most important mammalian character of rat?
Rats generally possess a pointed head, large eyes, and prominent, thinly furred ears. They have long legs and long, sharp claws. Depending on the species, variable size of fleshy pads is present on the bald soles of their narrow hind feet. Rat is a mammal and exhibits the presence of mammary glands.