The layer of serosa that is indistinguishable from the outer surface of the heart is the:

You need to take your dog to get spayed, which involves removing the pup’s reproductive organs. Assume there are no complications that would require the surgical procedure to be modified. Where would you expect the incision to be located?

As a baby drops lower in the uterus, it will cause a stretch of the cervix in a pregnant female. Consequently, oxytocin will be released, which will cause the initiation of uterine contractions. The baby pushing against the cervix will release more oxytocin. What will stop this cycle?

The thyroid gland is under the control of the pituitary gland. When the level of thyroid hormones (T3 and T4) drop the pituitary gland produces thyroid stimulating hormone (TSH), which stimulates the thyroid to produce more hormones. Under the influence of TSH, the thyroid will manufacture and secrete more T3 and T4, thus raising blood levels of thyroid hormones. The pituitary gland senses this and will decrease TSH production. This cycle is an example of a(n):

An example of a gland that utilizes apocrine secretion is: 

Erythrocytes do not have a nucleus.

Sudoriferous and sebaceous glands are examples of:

In order to connect the ________ containing the ___________, there are networks of tiny canals called _________ .

The human body obtains vitamin D either from the diet or sun exposure. Darker-skinned individuals require more sunlight to create adequate vitamin D stores as the increased melanin in their skin acts like sunscreen; thus, it blocks the necessary UV required for vitamin D synthesis. Therefore, if these individuals spend inadequate time in the light, dietary sources of vitamin D are necessary. What form of vitamin D requires sunlight for its formation?

What ends the positive feedback loop after a damaged endothelium starts the clotting cascade and aggregation of platelets to repair the integrity of the artery wall?