Human Anatomy and Physiology Answers

One student argued that the dermis is represented by dense connective tissue, the other that the dermis is represented by loose connective tissue. Which student is right? Describe the structure of the dermis.

One student claimed that there are macrophages and lymphocytes in the epidermis, another denied this, arguing that there are no blood vessels in the epidermis. What are the students right? Name the cells of the epidermis.

. It is known that granules of pigment - melanin can be found in two types of cells of the skin epidermis: melanocytes and keratinocytes. Explain the mechanisms of the appearance of melanin granules in these types of cells. Which cell is involved in its synthesis?

The micrographs show various areas of the skin. What are the characteristics that distinguish “thick skin” from “skin with hair” (or “thin skin”).

With mechanical damage to the epidermis, it is restored. What differons are involved in this?

Investigating the theft of a supermarket, police officers quickly found the culprit from the fingerprints he left on the safe. Uncover the secret of the origin of the skin pattern on the fingertips.

In a comparative analysis of the structure of the skin of the finger and the scalp, it was noted that the skin of the finger has more developed granular,lucida and stratum corneum layers of the epidermis, as well as the dermis. Can this be explained by the functional features of the skin of various parts of the body and how?

. Under the influence of ultraviolet rays of Europeans, it becomes brown. When the rays stop acting, the skin brightens after a while, with the exception of certain areas (around the breast nipple, scrotum, etc.). What determines the color of the skin that changes with ultraviolet radiation? What cells are involved in this? What does this mean for the body?

Mitral Vlave in mammalian heart guards the opening between

a pulmonary vein snd left auricle

b right atrium and right ventricle

c left atrium and left ventricle

d left ventricle and dorsal aorta