Question

Observation: Digestive System in Pigs 1. Using these terms (esophagus, large intestine, small intestine, stomach) trace the path of food from mouth to the anus small intestine esofhaus large intestine Slorach anus 2. Open the mouth, and insert a blunt probe into the esophagus ( 15.10). Then trace the crophagus stomach 31. Open one side of the stomach and examine its interior surf . Does it appear smooth or rough Snroth L s 4. Find the pyloric sphincter, the muscle that surrounds the entrance to the duodenum, the first par small intestine. Record the length of the small intestin fuzzy inside finger like pechos If you have not done so before, find the bile duct that empties into the duodenam. The bile duct comes from the call bladd 5. Find the cecum, a projection where the small intestine enters the large intestine. How does the appearance of the pig's large intestine differ from that of a human the are intestines wider in diameter than the small intestine 6. Carefully cut the mesenteries holding the colon of the large intestine in place, and uncoil the large intestine. Record the length of the large intestine. - How does the length of the large intestine How does the length of compare with that of the small intestine? 7. Locate again the liver, pancreas, and gallbladder, three accessory organs of digestion Observation: Cardiovascular System in Pigs Heart 1. Trace the path of blood through the heart, starting with the vena cava and ending with the aorta. Mention all the chambers of the heart and the valves (see Fig. 14.2). To the heart: From the lungs: vena cava aumbilical arteries _valve - valve valve valve aorta 2. Keeping the heart inside the pig, cut the pericardial sac (the tissue that surrounds the heart). 3. Look for and identify the vessels attached to the heart 4. Section the heart, and look for its four chambers. Remnants of the atrioventricular valves can be seen as thin sheets of whitish tissue attached to fine, white, tendinous strands. 5. With your blunt probe, find the oval opening in the wall between the two atrial chambers. Recall that this is a shunt that allows blood to bypass lung circulation prior to birth. 15-12 Laboratory 15 Basic Mammalian Anatomy

Answer 1

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Observation: Digestive system in pigs.

1.path of food will be mouth-esophagus-stomach-small intestine-large intestine-anus.

3.Surface of stomach from inside-smooth but some regions may contain folds called rugae.

4.Length of small intestine can be 15-20 metres.(write a number between 15 to 20) , second blank is gall bladder and liver.

5.pig's large intestine is spiral.

6.length of large intestine-5 metres, second blank -It is much shorter than small intestine.

Observation-Cardiovascular system in pigs.

1.Path of blood flow:vena cava-Right atrium-Right Atrioventricular valve-Right ventricle-semilunar valves-Pulmonary artery-lungs-pulmonary vein-left atrium-Left atrioventricular valve-left ventricle-semilunar valve-aorta