Pacinian corpuscles' are found in

Correct Answer: A

Rationale: The correct answer is A: Skin. Pacinian corpuscles are sensory receptors responsible for detecting pressure and vibration. They are located in the skin's deeper layers, particularly in the subcutaneous tissue. These receptors adapt quickly to changes in pressure, making them ideal for detecting dynamic stimuli. Choices B, C, and D are incorrect as Pacinian corpuscles are not typically found in the alimentary canal, liver, or lungs. The specific location of Pacinian corpuscles in the skin is crucial for their function in sensing external stimuli and transmitting sensory information to the brain.

Correct Answer: D

Rationale: The correct answer is D: Lysozyme. Lysozyme is an anti-bacterial enzyme found in tears that helps protect the eyes from infections. It works by breaking down the cell walls of bacteria, thus preventing their growth. Lacrimin (A) is a protein involved in tear production, not an anti-bacterial enzyme. Interferon (B) is a protein produced by the immune system to fight viruses, not found in tears. Pepsin (C) is a digestive enzyme produced in the stomach, not present in tears. Therefore, the correct answer is D because lysozyme is the specific anti-bacterial enzyme found in tears.

Correct Answer: C

Rationale: The correct answer is C: Hippopotamus. Sudorific glands are sweat glands responsible for regulating body temperature. Hippopotamuses have sudorific glands confined to their external ears, which help them cool down. Deer and kangaroos do not have sudorific glands in their external ears. Choice D, "Acting as receptor organ," is vague and unrelated to the function of sudorific glands.

Correct Answer: D

Rationale: The long and hard hairs on a rabbit's upper lip, known as whiskers, serve multiple purposes. Firstly, they provide tactile stimulation by helping the rabbit sense its surroundings. Secondly, they aid in pressure stimulation, helping the rabbit navigate through tight spaces. Finally, they play a role in temperature stimulation by detecting changes in the environment. Therefore, the correct answer is D, "All of the above," as whiskers serve all these functions. Choices A, B, and C are incorrect because they each represent only one aspect of the whiskers' function, while the correct answer encompasses all of them.

Correct Answer: A

Rationale: The correct answer is A: Unstriped arrector pili muscles. These muscles are attached to the hair follicles in the dermis. They contract in response to stimuli like cold or fear, causing the hair to stand up (goosebumps). Choice B, "Goose flesh," is a sensory response caused by the contraction of arrector pili muscles, not the attachment itself. Choices C and D, Vibrissae and Panniculus adiposus, are not directly involved in the attachment of hair follicles in the dermis.