Pig Dissection Answers - Displaying top 8 worksheets found for this concept. Some of the worksheets for this concept are Fetal pig dissection lab, Pig dissection work answers, Fetal pig dissection lab, Fetal pig lab guide answers pdf, Pig heart dissection questions answer key, Fetal pig coloring with labeled anatomy, Pig heart dissection lab answer key, Cat dissection work answer key.
Displaying top 8 worksheets found for - Answers To Pig Dissection. Some of the worksheets for this concept are Fetal pig dissection lab, Pig dissection work answers, Pig heart dissection questions answer key, Fetal pig lab guide answers pdf, Fetal pig coloring with labeled anatomy, Fetal pig anatomy word search answers, Fetal pig dissection answers key, Digestive system regents biology lab.

Teacher's Guide for Fetal Pig Dissection This is a handout for use during the fetal pig dissection. It includes instructions, images and steps to complete the lab; includes external anatomy, digestive system, circulatory system, and urogenital system.

Name:______________________________________________Hour:________Date:_______

External Anatomy of the Fetal Pig

1. Determine the sex of your pigby looking for the urogenital opening. On females, this opening is located nearthe anus. On males, the opening is located near the umbilical cord.

If your pig is female, you shouldalso note that urogenital papilla is present near the genital opening. Malesdo not have urogenital papilla.

Both males and females have rowsof nipples, and the umbilical cord will be present in both. What sex is your pig? _________

2. Make sure you are familiar withterms of reference: anterior, posterior, dorsal, ventral. In addition, you'llneed to know the following terms

Medial: toward the midline or middleof the body | Lateral: toward the outside of the body
Proximal: close to a point of reference | Distal: farther from a point of reference

3. Open the pig's mouth and locatethe hard and soft palate on the roof of the mouth. Can you feel your own hardand soft palates with your tongue?

Note the taste buds (also known assensory papillae) on the side of the tongue. Locate the esophagus at the backof the mouth. Feel the edge of the mouth for teeth.

Does the fetal pig haveteeth? ________ How many? ______

Are humans born with teeth? ________

4. Use a scalpel to cut the angles of the jaw so that you can open the mouth up far enough to view the back of the throat. Locate the epiglottis, a cone-shaped structure which closes when a pig swallows. The small opening in the center of the epiglottis is the glottis and it leads to the trachea and then to the lungs. Make sure that you can distinguish the glottis from the esophagus.

5. Gestation for the fetal pig is112-115 days. The length of the fetal pig can give you a rough estimate of itsage.

11mm - 21 days | 17 mm - 35 days | 2.8 cm - 49 days
4 cm - 56 days | 22 cm - 100 days | 30 cm -- birth

How old is your fetal pig? ______

6. Observe the toes of the pig. Howmany toes are on the feet? _________________

7. Observe the eyes of the pig, carefullyremove the eyelid so that you can view the eye underneath.

Does it seem welldeveloped? Do you think pigs are born with their eyes open or shut? _________________________________

8. Carefully lay the pig on one sidein your dissecting pan and cut away the skin from the side of the face and upperneck to expose the masseter muscle that works the jaw, lymph nodes, and salivaryglands. The salivary glands kind of look like chewing gum, and are often lostif you cut too deeply.

Image Credit: Fetal Pig Dissection Manual, Alexandra Altamura

The Anatomy of the Fetal Pig (internal)

In this activity, you willopen the abdominal and thoracic cavity of the fetal pig and identify structures.Remember, that to dissect means to 'expose to view' - a careful dissectionwill make it easier for you to find the organs and structures. Be sure to followall directions.

The Incision

Place your fetal pigin the dissecting pan ventral side up. Use string to 'hog-tie'your pig so that the legs are spread eagle and not in your way. Use scissorsto cut through the skin and muscles according to the diagram. Do not removethe umbilical cord. In the first section, you will only examine the abdominalcavity (the area below the ribcage).

After completing thecuts, locate the umbilical vein that leads from the umbilical cord tothe liver. You will need to cut this vein in order to open up the abdominalcavity.

Your pig may be filledwith water and preservative, drain over the sink if necessary and rinseorgans. Locate each of the organs below, check the box. ✔

1. Diaphragm. Thismuscle divides the thoracic and abdominal cavity and is located near the ribcage.
The diaphragm aids in breathing.
2. Liver. This structure is lobed and is the largest organ in the body.The liver is responsible for making bile for digestion.
3. Gall bladder. This greenish organ is located underneath the liver;the bile duct attaches the gall bladder to the duodenum. The gall bladder storesbile and sends it to the duodenum, via the bile duct.

Fetal pig dissection and lab guide answer key

4. Stomach. A pouch shaped organ that rests just underneath and to thepig's left. At the top of the stomach, you'll find the esophagus. The stomachis responsible for churching and breaking down food.
5. At each end of the stomach are valves that regulate food entering and leavingthe stomach. At the esophagus is the cardiac sphincter valve, and atthe duodenum is the pyloric sphincter valve. View the inside of the stomachby slicing it open lengthwise.
6. The stomach leads to the small intestine, which is composed of theduodenum (straight portion just after the stomach) and the ileum (curlypart).
7. The ileum is held together by mesentery. In the small intestine, furtherdigestion occurs and nutrients are absorbed through the arteries in the mesentery.These arteries are called mesenteric arteries.

8. Pancreas: a bumpy organ located along the underside of the stomach,a pancreatic duct leads to the duodenum. The pancreas makes insulin, which isnecessary for the proper uptake of sugars from the blood.
9. Spleen: a flattened organ that lies across the stomach and towardthe extreme left side of the pig. The spleen stores blood and is not part ofthe digestive system. On the underside of the spleen, locate the splenic artery.

Fetal Pig Dissection Lab Analysis Questions

10. At the end of the ileum, where it widens to become the large intestine,a 'dead-end' branch is visible. This is the cecum. The cecumhelps the pig digest plant material.
11. The large intestine can be traced to the rectum. The rectum liestoward the back of the pig and will not be moveable. The rectum opens to theoutside of the pig, or the anus. The large intestine reabsorbs water from thedigested food, any undigested food is stored in the rectum as feces.
12. Lying on either side of the spine are two bean shaped organs: the kidneys.The kidneys are responsible for removing harmful substances from the blood,these substances are excreted as urine. (more on this later)
13. Two umbilical vessels can be seen in the umbilical cord, and theflattened urinary bladder lies between them.

1. __________________________________
2. __________________________________
3. __________________________________
4. __________________________________
5. __________________________________
6. _______________________

Fetal Pig Lab Guide Answers