In most lab classes, you will have a lab manual that contains background for the lab and directions for doing the lab procedure. There may also be handouts or other materials you have access to.
Fetal Pig Dissection Background: Mammals are vertebrates having hair on their body and mammary glands to nourish their young. The placenta is the source of food and oxygen for the fetus, and it also serves to get rid of fetal wastes.
The dissection of the fetal pig in the laboratory is important because pigs and humans have the same level of metabolism and have similar organs and systems. Objectives of fetal pig dissection: Identify important external structures of the fetal pig anatomy.
Compare the functions of certain organs in a fetal mammal with those of an adult mammal. Before observing internal or external structures of the fetal pig, use your dissection manual, textbook, and dissection notebook to answer the pre-lab questions on the fetal pig.
You may have to refer to more than one dissection manual to answer all the questions so trade and share with other dissection groups.
Prelab questions your time and be sure to clean up all equipment and working area each day before leaving. Day 1 — External Anatomy Obtain a fetal pig and rinse off the excess preservative by holding it under running water. Also locate the anterior and posterior ends. A fetal pig has not been born yet, but its approximate age since conception can be estimated by measuring its length.
Locate the eyelids and the external ears or pinnae. Find the external nostrils. Count and record the number of toes and the type of hoof the pig has. Locate the umbilical cord.
With scissors, cut across the cord about 1 cm from the body. Examine the 3 openings in the umbilical cord. The largest is the umbilical vein, which carries blood from the placenta to the fetus.
The two smaller openings are the umbilical arteries which carry blood from the fetus to the placenta. Study the ventral surface of the pig and note the tiny bumps called mammary papillary.
4. What are some questions you have about the lab? Look for aspects of the lab--related to the scientific concept, procedure, or anything else—that you don't understand or would like to know more about. Turn these into a list of questions. These questions provide a focus of inquiry for the lab. Melting Point PreLab Questions: This MUST be completed before you begin laboratory work 1. List six physical properties of organic compounds that are often measured by organic chemists in attempting to identify a compound%(7). Answer the following questions and write the equations (molecular and net ionic) for all reactions that occur. a. Will sodium metal react with water? b. Does nickel react with water? with HCl? with a tin nitrate solution? c. Will gold react with a nickel nitrate solution? d. .
These are present in both sexes. In the female these structures connect to the mammary glands.
Determine the sex of your pig by locating the urogenital opening through which liquid wastes and reproductive cells pass. In the male, the opening is on the ventral surface of the pig just posterior to the umbilical cord.
In the female, the opening is ventral to the anus. Record the sex of your pig. Carefully lay the pig on one side in your dissecting pan and cut away the skin from the side of the face and upper neck to expose the masseter muscle that works the jaw, lymph nodes, and salivary glands.
Label these on your hand-in. Your incision should extend posteriorly through the jaw. Spread the jaws open and examine the tongue. Observe the palate on the roof of the mouth. The anterior part of the palate is the hard palate, while the posterior part is the soft palate.
Locate the epiglottis, a cone-shaped structure at the back of the mouth. Above the epiglottis, find the round opening of the nasopharynx.
This cavity carries air from the nostrils to the trachea, a large tube in the thoracic which supplies air to the lungs. Dorsal to the glottis, find the opening to the esophagus. Examine the tongue and note tiny projections called sensory papillae. Examine the teeth of the pig.Steve Zumdahl is the author of market-leading textbooks in introductory chemistry, general chemistry, honors-level chemistry, and high school chemistry.
1 ee power electronics lab reference manual semester vi department of electrical and electronics engineering srm university kattankulathur 05/13/16 page 3 Post-lab Quiz Results You scored % by answering 4 out of 4 questions correctly.
1. Pepsin would be most active You correctly answered: b. in the stomach. Ascariasis infections begin when people swallow worm eggs that they have picked up from infected food or from soil.
When the eggs hatch in the small intestine, they become larvae and swim through the bloodstream to the lungs, and then on to the throat, where they are swallowed. In other words, show the link between your response to question #2 (what you will do in the lab) to your response to question #1 (what you are supposed to be learning about by doing the lab).
4. What is your hypothesis for the lab experiment? First, identify the variables in the experiment. Lab Acids and Bases Introduction Pre-lab Questions 1. What is a neutralization reaction?
A neutralization reaction occurs when an acid and a base react with each other and cancel each other out so that the product formed has neither acidic nor basic properties.