1.
Human skin is a waterproof fabric that serves as a first line of defence against injury or invasion by hostile organisms. This protective ability is due to the presence of a substance called .
Correct Answer
A. Keratin
Explanation
Keratin is the correct answer because it is a substance present in the human skin that contributes to its protective ability. Keratin is a tough and fibrous protein that forms a waterproof barrier on the surface of the skin, preventing water loss and protecting against injury and invasion by harmful organisms. It helps to maintain the integrity and strength of the skin, making it an essential component of the first line of defense provided by the skin. Melanin is responsible for skin pigmentation, while the epidermis is the outermost layer of the skin.
2.
Skin is capable of becoming thicker if exposed to wear and tear.
Correct Answer
A. True
Explanation
Skin is capable of becoming thicker if exposed to wear and tear because the body has a natural response to protect itself. When the skin is subjected to repeated friction or pressure, such as through regular physical activity or manual labor, the body responds by increasing the production of collagen and keratin. These proteins help to strengthen and thicken the skin, providing a protective barrier against further damage. This process is known as skin adaptation and is a normal physiological response.
3.
The skin plays a vital role in the regulation of our body temperature, as; (Select Three)
Correct Answer(s)
A. It is a protective covering.
C. It excretes waste products.
D. It is an important sensory organ.
Explanation
The skin is a protective covering that acts as a barrier against external elements, preventing the entry of harmful substances and microorganisms. It also helps to regulate body temperature by controlling the loss of heat through sweat glands and blood vessels. Additionally, the skin excretes waste products such as sweat and sebum, which helps to eliminate toxins from the body. Lastly, the skin contains sensory receptors that allow us to perceive touch, pressure, temperature, and pain, making it an important sensory organ.
4.
What is the Stratum spinosum?
Correct Answer
C. It is derived from the basal cells layer by mitosis.
Explanation
The Stratum spinosum is derived from the basal cells layer by mitosis.
5.
Amongst the deeper cells of the epidermis are a number of branching cells called melanoblastos.
Correct Answer
B. False
Explanation
The statement is false because the correct term for the branching cells found in the deeper cells of the epidermis is melanocytes, not melanoblastos. Melanocytes are responsible for producing and distributing the pigment melanin, which gives color to the skin, hair, and eyes. Melanoblastos is not a recognized term in the context of skin cells.
6.
Capillaries extend into the dermal ridges or papillae but do they enter the epidermis?
Correct Answer
B. No
Explanation
Capillaries do not enter the epidermis. They extend into the dermal ridges or papillae, which are found in the dermis layer of the skin. The epidermis, on the other hand, is the outermost layer of the skin and does not contain blood vessels. Therefore, capillaries do not enter the epidermis.
7.
The main part of the sweat gland is situated in the .
Correct Answer
B. Dermis
Explanation
The sweat gland is mainly located in the dermis. The dermis is the second layer of the skin, located below the epidermis. It contains various structures such as blood vessels, nerves, hair follicles, and sweat glands. Sweat glands are responsible for producing sweat, which helps regulate body temperature and eliminate waste products. Therefore, the correct answer is the dermis.
8.
Sweat glands are found in the skin all over the body, but are most abundant in the: (Select Three)
Correct Answer(s)
A. Palms of the hands
B. Soles of the feet
D. Forehead
Explanation
Sweat glands are found in the skin all over the body, but they are most abundant in the palms of the hands, soles of the feet, and forehead. These areas have a higher concentration of sweat glands compared to other parts of the body. The palms of the hands and soles of the feet have a higher number of sweat glands to help with grip and traction, especially when the hands or feet become moist. The forehead also has a higher density of sweat glands to help regulate body temperature and cool down the body.
9.
Nails are developed from the stratum of the nail bed and composed of densely packed keratinised cells.
Correct Answer
B. Lucidum
Explanation
Nails are developed from the stratum lucidum of the nail bed and composed of densely packed keratinised cells.
10.
Bromidrosis is a very similar condition to hyperhydrosis, but is accompanied with an offensive odour, usually most pronounced interdigitally and on the soles.
Correct Answer
A. True
Explanation
Bromidrosis is a condition that is indeed similar to hyperhidrosis, but it is characterized by the presence of a foul odor. This odor is typically strongest between the fingers and on the soles of the feet. Therefore, the statement that Bromidrosis is accompanied by an offensive odor, particularly interdigitally and on the soles, is true.
11.
Which one do you like?
Correct Answer
A. Option 1