11.2 11.3 terminology

Question 1

myofilber

Answer 1

Thick with head like structures and actin is relatively thin.

Question 2

Sarcoplasmic reticulum

Answer 2

A membrane bond structure found in muscle cells with a smooth ER. Its function is to store calcium ions.

Question 3

Sarcolemma

Answer 3

Multiple nuclei that lie just inside the plasma membrane of muscle fibers They have multiple tunnel-like extensions that penetrate the interior of the cell.

Question 4

Sarcoplasm

Answer 4

The cytoplasm of muscle fibers that contain large numbers of organelles that store glycogen as an energy source. It also contains myoglobin.

Question 5

T-tubule

Answer 5

Present in satiated muscle and their role is to maintain the Sarcoplasmic Reticulum calcium store under the tight control of the membrane depolarization.

Question 6

Sarcomere

Answer 6

Found in the The myofibrils, sarcomeres are dominated by proteins actin and myosin. The repeating sarcomeres are the reason why striated muscle has a banded pattern.

Question 7

Myofibril

Answer 7

Run the length of the cell and they are parallel to each other. Numerous mitochondria are found packaged between them in order to supply ATP for muscle contractions.

Question 8

Z-line:

Answer 8

One sarcomere extends from one Z-line to the next. It defines the lateral boundaries of the sarcomere and is responsible for force transmission.

Question 9

M-line

Answer 9

Runs down the center of the sarcomere through the middle of the myosin filaments.

Question 10

Glomerulus

Answer 10

filters various substances from the blood.

Question 11

Bowman’s capsule

Answer 11

Surrounds the glomerulus. Inside the capsule, the afferent arteriole branches into a capillary bed (glomerulus). The increase in blood pressure is produced by the efferent arteriole, which drains blood from glomerulus.