Why are epithelial membranes classified as organs?

Rickets is a childhood disorder characterized by impaired bone mineralization due to inadequate calcium absorption. According to the vitamin D activation pathway, which sequence correctly describes how the skin helps prevent rickets?

Which type of sweat gland is the most numerous and secretes directly onto the skin surface?

The nonliving material that surrounds connective tissue cells is called the ________.

A patient with kidney disease has reduced blood calcium levels despite adequate sun exposure. This condition is most likely due to impaired absorption of:

A patient undergoing chemotherapy notices slowed nail growth. Damage to which structure would most directly account for this change?

Which pair correctly matches a gland type with its secretion pathway and example?

Which epidermal layer consists of a single row of stem cells and shows intense mitoticactivity?

Nervous tissue is composed primarily of which two cell types?

A gland is defined as: