Anatomy And Physiology - Qp2

The correct answer is Stratum basale and Stratum spinosum. The epidermis of the skin is composed of several layers, and two of these layers are the Stratum basale and Stratum spinosum. The Stratum basale is the innermost layer of the epidermis and is responsible for the production of new skin cells. The Stratum spinosum is located above the Stratum basale and is involved in the synthesis of keratin, a protein that provides strength and protection to the skin. These two layers play important roles in maintaining the structure and function of the skin.

The dermis is the middle layer of the skin, located beneath the epidermis. It contains sweat glands, which are responsible for producing sweat and regulating body temperature. Nerve fibers are also present in the dermis, allowing for sensation and communication between the skin and the brain. Capillaries, tiny blood vessels, are found in the dermis and provide oxygen and nutrients to the skin cells. Vitamin D formation, on the other hand, occurs in the epidermis when the skin is exposed to sunlight.

The skin is the largest organ in the body and is responsible for protecting the body from external threats. It contains many nerve endings that transmit sensory information to the brain, allowing us to feel touch, temperature, pressure, and pain. These sensations help us respond to our environment and avoid potential harm. Therefore, the statement that the skin contains numerous nerve endings that convey sensations to the brain and help protect the body is true.

The skin serves as a protective covering for our body, shielding it from external factors such as harmful UV rays, bacteria, and physical injuries. It also excretes waste products through sweat, which helps in regulating body temperature and removing toxins. Additionally, the skin is an important sensory organ that allows us to perceive touch, pressure, temperature, and pain.

The explanation for the given correct answer is that the dermis is indeed attached to the epidermis by projections called papillae. The dermis is the inner layer of the skin and is composed of fibrous and connective tissue. This attachment between the dermis and epidermis is important for the structural integrity and function of the skin.

The statement is false because the main part of the sweat gland is actually situated in the dermis, not the epidermis. The sweat gland consists of a coiled tube that extends from the dermis into the epidermis, where it opens onto the skin's surface. However, the majority of the sweat gland is located in the dermis, where it produces sweat before it is transported to the epidermis.

Capillaries are tiny blood vessels that are responsible for delivering oxygen and nutrients to tissues and removing waste products. In the skin, capillaries extend into the dermal ridges or papillae, which are structures that help create fingerprints. However, they do not enter the epidermis, which is the outermost layer of the skin. This is because the epidermis is avascular, meaning it does not have its own blood supply. Therefore, the statement that capillaries extend into the dermal ridges or papillae but do not enter the epidermis is true.

The explanation for the given correct answer is that the deep fascia is indeed closely related to the skin and plays a crucial role in the mobility of the skin over the underlying structures. This relationship allows for movement and flexibility of the skin, which is important for various bodily functions and activities. Therefore, the statement is true.