For the cat lab, there is no hypothesis as this is a observational activity. The purpose of this lab is to compare the anatomy and physiology of a Domestic House Cat, to that of a human. The references are “New” Lab manual, and Disecction of the Cat. The scale of refrence is one bar = 3mm.
Anatomy, Observations and Comparisons: External Anatomy.
Firstly, when we got to our table, we removed our cat, which was a black and white spotted cat, and its number was 4. From head to tail, the length of our cat was 71 cm. I noticed the cat was very stiff, and this was because of Vigor Mortis, which is when the cat died, myosin and actin no longer detach. There was an incision right under the neck of the cat, which is where the embalming fluid is injected. The first thing that was labeled was the vibrissae, which are the whiskers, and this is a structure that humans do not have. Next were the external nares, otherwise known as the nostrils, which are found in a human. Lastly the Philitrum was labeled, which is the groove that seperates the nostrils. A human doesn’t necessarily have a philitrum, but they have an analagis. Next was the third eyelid, which is used to protect and cleanse the eye, and this was also not found in the human. Next to be labeled is the pinnae, which is the external ear and this is found on all mammals. The tori, which are cushions for the cat’s feet, 7 on the forefoot and 5 on the hindfoot, were not found in the human. The anus was next to be labeled, obviously in the human. Also the urogenital aperture was not found on our cat, as we had a male cat, so we had to find a female cat. The scrotum, found in both the human and cat is the covering of the testes. The prepuce, which is a swelling where the pe...
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...kidney from the bladder. The kidney also produces important hormones, such as EPO, which stimulates red blood cell growth, Calcitriol, which helps the colon absorb calcium, and renin, which controls blood pressure. The ureters are a pair of tubes which carry urine to the bladder. They are almost a foot long and run down the body. The ends of them reach into the bladder and there are valves, which prevent backflow. The bladder is a sac, which is hollow until it begins to be filled with urine. The maximum urine capacity is 600-800 ml. At around 200 ml, you begin to feel the urge to urinate. The urethra is a tube, which the urine passes through, and for females it ends at the clitoris, and for the males the penis. The flow is controlled by sphincter muscles, which are made up of smooth muscle. The urinary system is very important for the maintenance of homeostasis.
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