Question

part a
which layer of the epidermis will be supplied with the highest levels of oxygen from the blood?
○ stratum corneum
○ stratum granulosum
○ stratum basale
○ stratum spinosum
45.
part a
william has a cut that is superficial, not bleeding, and has affected his sense of touch where the cut is. based on this information, you
would predict that the cut has penetrated to ______.
○ the stratum corneum but not the stratum granulosum
○ the papillary layer but not the reticular layer
○ the subcutaneous layer, but no deeper
○ the stratum basale but not the dermal layers
46.
part a
the protein found in large amounts in the superficial layer of epidermal cells is keratin.
○ true
○ false
47.
part a
a substance received or given off by your body will likely pass through which tissue type?
○ epithelial tissue
○ connective tissue
○ nervous tissue
○ muscle tissue
48.
part a
glands, such as the thyroid, that secrete their products directly into the blood rather than through ducts are classified as ______.
○ exocrine
○ ceruminous
○ endocrine
○ sebaceous

Explanation:

Question 44 (Part A)

The epidermis is avascular, but cells get oxygen from the dermis' blood vessels via diffusion. The stratum basale is the deepest epidermal layer, closest to the dermis, so it gets the most oxygen (diffusion decreases with distance from the dermis).

A superficial, non - bleeding cut affecting touch: The stratum basale has touch - related receptors? No, the dermal papillary layer has touch receptors. Wait, no—epidermal layers: stratum basale is the deepest epidermis layer. A cut not bleeding (so not into dermis, as dermis has blood vessels) but affecting touch. Wait, the stratum basale is part of the epidermis. Wait, the options: "the stratum basale but not the dermal layers"—because if it's in stratum basale (epidermis, no blood vessels, so non - bleeding) and touch is affected (maybe nerve endings in epidermis? Or maybe the papillary layer? Wait, no—epidermal layers: stratum corneum (dead cells), stratum granulosum, stratum spinosum, stratum basale. A cut that's superficial, not bleeding (so epidermal, as dermis has blood), and affects touch. The stratum basale is the deepest epidermis, and maybe the nerve endings in the epidermis (but touch receptors are in dermis? Wait, no—maybe the question is that the cut is in the epidermis but reaches stratum basale (where mitotic cells are) and doesn't reach dermis (so no bleeding). And touch is affected because maybe the nerve fibers in the epidermis? Or maybe the correct option is "the stratum basale but not the dermal layers"—because if it's in stratum basale (epidermis, avascular, so non - bleeding) and touch is affected (maybe the sensory neurons in the epidermis? Or maybe the question's logic is that a cut in stratum basale (epidermal, no blood) and not dermal (so no bleeding) and touch is affected.

Keratin is a protein produced by epidermal cells (keratinocytes). In the superficial layers (like stratum corneum), the cells are filled with keratin (they are keratinized, dead cells). So the statement "The protein found in large amounts in the superficial layer of epidermal cells is keratin" is True.

Answer:

stratum basale

Question 45 (Part A)