Cardiac muscle

Question 1

do cardiac muscles have sarcomeres?

Answer 1

yes, the light/dark banding is just less visible

Question 2

is cardiac muscle voluntarily or involuntarily controlled?

Answer 2

involuntarily

Question 3

what are intercalated disks? what are they composed of?

Answer 3

intercalated disks indicate the edge of one cell and the beginning of another

they are made of desmosomes which keep the cells from tearing form one another when they contract; they are also composed of gap junctions held open between the cells by protein so that the cells can communicate

Question 4

what are the nuclei like in cardiac muscle cells? what is contained in the nucleus and why?

Answer 4

each cell has a central nucleus and is oval shaped; nucleolus is indicated by a purple dot in the nucleus. it is present because these cells make a lot of ribosomes to make protein

Question 5

what are the spaces in cardiac muscle caused by?

Answer 5

branching

Question 6

what is the stringy pink stuff in the spaces between cardiac muscle?

Answer 6

collagen is between the spaces and flat nuclei are present because they belong to fibroblasts which made the collagen

Question 7

what is the pattern of cardiac muscle tissue like?

Answer 7

striated