When the umbilical cord is tied after birth, the umbilical arteries close by filling in with
a) placental fluid.
b) platelet plugs.
c) connective tissue.
d) smooth muscle.
e) epithelial tissue.
c
You might also like to view...
The largest fat pad of the elbow is over the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following describes the operation of the heart and blood vessels?
A) systemic anatomy B) cardiovascular anatomy C) systemic physiology D) cardiovascular physiology
Answer the following statements true (T) or false (F)
1. The combination of an antigen and antibody can activate complement. 2. Complement is a group of proteins that are usually found in an inactive form in the blood. 3. Complement kills cells by drilling holes in the cell membrane, which allows sodium to rapidly leave the cell. 4. Complement kills cells by drilling holes in the cell membrane, which allows water to rapidly leave the cell. 5. Neutrophils are important phagocytes in the immune system.
Cholecystokinin is produced by endocrine cells of the
A. stomach. B. small intestine. C. pancreas. D. large intestine. E. liver.