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Discuss your dissection of the sheep heart and the cardiovascular system of the fetal pig by doing the following:

  1. The similarities and differences between the fetal pig heart and the sheep heart are that they both have two atria and two ventricles. Also, they are pale pink in color, have a similar blood flow structure, and aorta, superior vena cava, and pulmonary artery. Looking at the difference, the fetal pig heart is small as compared to the sheep heart. Also, the left ventricle of the sheep’s heart is thicker than the pig’s heart.
  2. The 4 valves of the heart include the following;
  • Tricuspid valve: located between the right ventricle and the right atria and is designed to ensure blood flows in a forward direction.
  • Aortic valve: Found between the aorta and the left heart ventricle. It opens path for blood to enter
  • Mitral valve: Found between the right and the left ventricles. This valve opens to allow blood to flow to the left ventricle
  • Pulmonary valve: This valve is found between the right pulmonary and right ventricle artery. Paves way for blood coming from the heart into the lungs.
  1. There are a number of similarities and differences between the heart’s left and the right ventricles. The similarities include following both have right and left side of the heart containing two chambers. Both have cardiac muscles and have valves which prevent blood from flowing in the wrong direction. Looking at the differences, the right heart side is not thicker than the left heart side. Also, the right ventricle is smaller in size as compared to the left ventricle.
  2. Looking at the comparison between the structures of the atrioventricular valves and that of the semilunar valve, it is apparent that the latter is thin and with endocardium tissues, while the former are thin and contain endocardium and connective tissues.
  3. The papillary muscle is found in the right and the left ventricles of the pig heart. These muscles are smooth and extend to the ventricular walls.

Discuss your dissection of the respiratory system of the fetal pig by doing the following:

  1. The structure of the trachea is banded tube with cartilage rings while the structure of the esophagus happens to be more muscular.
  2. The trachea as part of the respiratory system is a passage for air into the lungs. It divides into bronchi which then separates to form bronchioles
  3. The lungs of a fetal pig has a spongy texture and is both smooth and firm.
  4. While the left lung is made up of 4 lobes, the right lung has 3 lobes.

Discuss your dissection of the sheep kidneys and the urinary system of the fetal pig

  1. In comparison, the kidney of a sheep has a lighter color than that of a pig which is pale brown. Also, they both have assumed a bean shaped structure
  2. In a fetal pig, the kidney is found behind the abdominal organs and they are slightly embedded into the dorsal body wall.
  3. For urine to exit the body, it travels from the kidney and through the bladder into the uterus. It then passes through the urethra from the bladder.

Discuss your dissection of the components of the endocrine system of the fetal pig

  1. The two endocrine glands that are positioned in the throat region of the fetal pig include the thyroid and the thymus glands. The thymus gland secretes hormones that boost the immune system while the thyroid gland promotes metabolism.
  2. The three known endocrine glands which are found in the abdominal or pelvic cavities are:
  • Adrenal gland
  • Ovaria glands
  • Pancreatic glands

Discuss your dissection of the digestive system of the fetal pig

  • Mouth: Starts from the tongue found in the mouth and contributes to chewing, swallowing, and sensing food.
  • Pharynx: Found at the base of the tongue and the junction of the trachea and the esophagus where food finds its way into the stomach.
  • Stomach: Muscular organ that stores and digests food breaking it down into nutrients.


Bohensky, F. (2002). Photo manual and dissection guide of the fetal pig: with sheep heart, brain, eye. Place of publication not identified: SquareOne.

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