Question

The function of transverse tubules is to:________.

1. The function of transverse tubules is to rapidly move action potentials to the interior of the muscle fiber.
2. Conduct ATP molecules out of the mitochondria throughout the sarcoplasm.
3. Store Ca2+ ions inside the muscle fiber.
4. Ensure a supply of glycogen throughout the muscle sarcoplasm.

Answer 1

The function of transverse tubules is to rapidly move action potentials to the interior of the muscle fiber. (Option 1)

Step-by-step explanation:

The function of transverse tubules (T-tubules) is to rapidly move action potentials to the interior of the muscle fiber. This ensures that the action potential reaches the membrane of the Sarcoplasmic Reticulum (SR), causing the opening of calcium channels in the SR's membrane and leading to the release of Ca2+ ions. These ions diffuse into the sarcoplasm and trigger the contraction of the muscle fiber by acting on the sarcomeres, the muscle's contractile units.

The T-tubules are narrow invaginations of the sarcolemma that allow electrical impulses to be conducted deep into the muscle cell. The T-tubule, along with the terminal cisternae of the SR, forms a structure known as a triad. This arrangement facilitates the close proximity of the T-tubules with the SR, ensuring efficient communication and calcium ion transfer necessary for muscle fiber contraction and relaxation.

Answer 2

Answer is option "1"

Step-by-step explanation:

• A muscle fiber is simply a muscle cell, or the building blocks of muscles. See, like the rest of your body is made up of lots and lots of individual cells, your muscles are also made up of cells.
• Muscles are made up of groups of fascicles. When stimulated, they contract to produce motion. No more running, talking, walking and, well,
• muscle fiber types and muscular contraction Dark meat is composed primarily of slow fibers, and these slow fibers are more dependent on blood supply and oxygen, whereas light meat is composed of fast fibers, which are less dependent on blood and oxygen.
• Hence, the right answer is option 1 " Rapidly move action potentials to the interior of the muscle fiber"