What tissue has lacunae, calcium salts, and blood vessels?

A. Stratified epithelia are tall, narrow cells:Stratified epithelia are defined by having multiple layers of cells, not by cell shape. While some stratified cells can be tall (columnar), they can also be cuboidal or squamous in shape, depending on the location.

B. Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another:Pseudostratified epithelium appears multilayered because nuclei are at different levels, but all cells contact the basement membrane. It is not composed of multiple layers.

C. Stratified epithelia are present where protection from abrasion is important:Stratified epithelia provide multiple layers of cells, offering significant protection against mechanical stress, friction, and abrasion. This is why they are found in areas such as the skin, mouth, and esophagus.

D. Simple epithelia form impermeable barriers:Simple epithelia are composed of a single cell layer and allow for selective diffusion, absorption, or secretion rather than forming completely impermeable barriers.

A. Delivers important sensory information about our environmental conditions to our brains:The skin contains sensory receptors that detect touch, pressure, temperature, and pain, sending this information to the brain for interpretation.

B. Holds a portion of the blood's total volume to be shunted (diverted) to other organs when needed:The skin’s extensive vascular network can store blood and redirect it to vital organs during times of need, helping regulate blood pressure and thermoregulation.

C. Gives the body its overall shape, loss of this function can be seen with the drooping of skin with age:While the skin contributes to appearance and elasticity, the body’s overall shape is primarily determined by the skeletal system and underlying musculature.

D. Conducts chemical reactions using the sun’s energy to initiate vitamin D synthesis:The skin is essential for the synthesis of vitamin D when exposed to UVB rays from sunlight, which is a critical metabolic function supporting calcium homeostasis and bone health.