Question

3. Muscles located in the walls of the small intestine help push digested material along. Muscles located in the arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct?
a. Both sets of muscles are involuntary and smooth.
b. Both sets of muscles are voluntary and smooth.
c. Both sets of muscles are smooth, although one set is voluntary, and the other set is involuntary.
d. Both sets of muscles are voluntary, although one set is striated and the other set is smooth.

4. Which of the following sets of words best fills in the blanks in the following sentence? Despite their ______ structure, human bones are surprisingly ______ .
a. hollow; strong
b. solid; lightweight
c. compact; flexible d. spongy; fragile

I think 3. is A and 4. Is B

Answer 1

3 looks good ... take another look at 4

red blood cells are made in the bone marrow

Answer 2

is 4 D?

Answer 3

well, you've eliminated two of the answers

where do you think the bone marrow is?

Answer 4

red blood cells