Male Reproductive System Lab PDF

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complete lab for the cell reproductive lab...

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BIO 101 Pre-lab Lab 8 – Male Reproductive System

Name: _______________________________

Go to www.MasteringAandP.com. Once you have logged in, click on the blue “Study Area (myA&P)” button above the calendar. In the black bar on the left, click on PAL 3.0. On the next screen, click on the blue Practice Anatomy Lab 3.0 link at the top. In PAL, click on the Histology tab. Click on Reproductive System. There are 37 slides showing histology of the Reproductive system. We will be looking at Slides 3, 5, 6, 7, and 9. Slide 3: Click “Show Labels.” In this image, you should be able to identify all labeled structures. Notice that this is at 1600x magnification. Sperm are really small!!! Using the bottom of page 1029 and page 1032, answer the following questions. a. What is located inside the head of the sperm?-a flattened nucleus containing compacted DNA b. What does the acrosome contain? –hydrolytic enzymes i. What is the function of these contents?-enables the sperm to penetrate and enter an egg c. The midpiece is packed full of many mitochondria that provide metabolic energy for the movements of the tail. Slide 5: Be able to identify the Seminiferous tubules. We will be taking a closer look at these tubules in the next couple slides. Notice how many there are and how closely packed they are. The testes are packed FULL of tightly coiled seminiferous tubules. Each seminiferous tubule is roughly as wide as 2 strands of hair. Slide 6: Be able to identify Interstitial cells, Spermatids, Primary spermatocytes, and Spermatogonia. Use page 1029 and Fig. 27.8 on page 1031 to fill in part (a) below. a. Notice that the Spermatogonia are located closest to the basal membrane (the wall) of the tubule. These cells are the stem cells that give rise to all spermatogenic cells. The first cells to head down the path to becoming sperm are primary spermatocyte (notice that they are closest to the spermatogonia). As the cells complete Meiosis I and begin Meiosis II, they are now referred to as secondary spermatocytes. Once Meiosis II is completed, the cells are now spermatids. These have the same amount of genetic material that sperm will have, but they do not have the appearance of sperm. Instead, they are small spherical cells. The spermatids must go through a process called spermiogenesis to develop the characteristic shape and structure of a sperm (See Fig. 27.9). By the end of this process, the sperm has a head, a midpiece, and a tail. This process takes place near the lumen of the seminiferous tubule so that the fully-formed sperm can be released from the wall of the seminiferous tubule and travel through the lumen to the epididymis where they will develop their motility. b. What is the function of Interstitial cells (Interstitial endocrine cells)? (Pg 1021)-production of androgens (testosterone)

BIO 101 Pre-lab Lab 8 – Male Reproductive System

Name: _______________________________

Slide 7: Be able to identify the Spermatogonia, Primary spermatocytes, and Spermatids. Notice the fullyformed sperm near the lumen of the seminiferous tubule. The apparent smears of tissue in the lumen are the bundles of tails of the sperm. Also realize that the process of sperm formation takes an incredible amount of time considering that the average male produces 200-400 million sperm EVERY day. It takes 60-80 days for the formation of sperm from a spermatogonium. It then takes another 20 days for the sperm to gain motility within the epididymis. That’s about 3 months!!! And to think that there are enough sperm developing in the testes to produce as many as 400 million mature sperm a day!! And they’re ALL genetically unique!! It’s incredible!! Slide 9: This is so cool!! You can see the cells in different stages of cell division!

Click on the Home button in the upper left corner of the screen. Click on the Human Cadaver tab and select the Reproductive System. There are 11 slides for the Reproductive system. We will be looking at Slides 3, 5, and 8. Slide 3: You should be able to identify the Epididymis, Ductus (vas) deferens, Penis, and Testis. a. As discussed above, sperm are formed in the seminiferous tubules and they gain motility in the epididymis. Once they are fully mature, they are stored for up to 3 days in the epididymis in anticipation of ejaculation. If ejaculation occurs, the sperm travel through the Ductus (vas) deferens to eventually join the urethra in order to leave the body. Slide 5: You should be able to identify all labeled structures on this slide. a. Please note that even though the corpora cavernosa is highlighted as one large structure, it is actually composed of two independent bodies of erectile tissue, each referred to as a corpus cavernosum. These bodies are each surrounded by the fibrous tunica albuginea (whitish layer surrounding the erectile tissue). (See page 1023) b. Notice how sponge-like the erectile tissue is!! What is the name of the third body of erectile tissue in the penis? Corpus Spongiosum i.

What does this erectile tissue surround? –the urethra

ii. Why do you think this needs to be surrounded by erectile tissue?

Slide 8: You should be able to identify all labeled structures on this slide....