Question

A surgeon removes two pieces of muscle from different parts of the body. Muscle A has alternating dark and light markings. Muscle B does not. Which of these statements is most likely true?

Muscle A is smooth muscle; muscle B is cardiac or skeletal muscle.
Muscle A is skeletal or smooth muscle; muscle B is cardiac muscle.
Muscle A is cardiac muscle; muscle B is skeletal or smooth muscle.
Muscle A is cardiac or skeletal muscle; muscle B is smooth muscle.

i believe it A

Answer 1

now i think it b

Answer 2

@jgirl128

Answer 3

@InExileWeTrust

Answer 4

@KyanTheDoodle

Answer 5

yes finally. Please help me

Answer 6

the alternating dark and light markings are called striations.

"Striations are a key attribute to identify skeletal and cardiac muscle types. Although striations are usually visible in most sections of these muscle types, it can sometimes take a little adjustment of the microscope lighting to see them clearly. Also, striations are only visible in longitudinal views of myofibers so it is essential some part of the muscle section being evaluated includes this type of cut."

http://www.mhhe.com/biosci/ap/histology_mh/strimusc.html

Answer 7

I'm pretty sure the answer is D.

Answer 8

thank you going to reaad the link you sent me . Can you alos please help me with another question

Answer 9

(talking about the skeletal muscle)

"The sarcoplasm also has many alternating light and dark bands, giving the fibre a striped or striated appearance (hence the name striated muscle)."

(talking about the cardiac muscle)

"Its fibres , like those of skeletal muscle, have cross-striations and contain numerous nuclei. However, like smooth muscle tissue, it is involuntary. Cardiac muscle differ from striated muscle in the following aspects: they are shorter, the striations are not so obvious, the sarcolemma is thinner and not clearly discernible, there is only one nucleus present in the centre of each cardiac fibre and adjacent fibres branch but are linked to each other by so-called muscle bridges."

http://www.botany.uwc.ac.za/sci_ed/grade10/mammal/muscle.htm

Answer 10

I can try.