Rat Dissection

1986 Words Dec 4th, 2011 8 Pages
1) The length of the tail: 18.5 cm 2) The length of the body ( from the tip of the nose to the base of the tail: 22cm
What is their relative proportion? 1.2:1
PART A (Overview) pg. 462-464 a) Draw a diagram of the rat when it is first cut opened and the internal organs are exposed. Identify and label the diaphragm, the stomach, the small intestine, the caecum, the heart, the left and right lung, the trachea and the esophagus. (Note: see Figure 22 on pg 470 for an example)

b) What structure divides the thoracic and abdominal cavities? The Diaphragm divides the thoracic and abdominal cavities.

c) What is the sex of your rat? Male.

Part C Digestive System pg 467
Skip the Salivary glands on pg 467 and continue with the Mouth on
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The ripple effect on the trachea is there to help provide stability, and allow the trachea to remain open.

P) What is the function of the cartilaginous rings? In the chest cavity, pressure builds up quickly, and the rings across the trachea hold it open. Without the rings, the trachea would collapse making it impossible to breathe.

Part G Circulatory System pg. 481
Q) After examining the ventricle walls the muscular walls of the ventricles which ventricle wall is thicker? Can you suggest why? The left side of the heart has a thicker ventricle wall because the left side is responsible for pumping oxygenated blood into the aorta which provides oxygen to all parts of the body.
R) Trace or copy Figure 35b (pg 482). Indicate the flow of blood through the heart on the drawing. Use a red pencil for oxygenated blood and a blue pencil for de-oxygenated blood.

Analysis
S) Indicate the location and function(s) of each of the following (summarize your answer in a table). Organ | Location | Function(s) | Stomach | Between the esophagus and small intestine. | The stomach digests and stores the food we ingest. It breaks down the food into a liquidly mixture called “chyme” and this fluid is then slowly released into the small intestines. | Liver | Right side of the abdominal cavity and beneath the diaphragm. | The liver produces substances that break down fats. It converts glucose to glycogen. Produces urea and makes certain amino acids. Also

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