Answer:
1. E) During muscle contraction all of the answers above are correct.
2. A) Myosin pulls actin filaments toward the M disk.
Explanation:
The mechanism of muscle contraction is also known as the sliding filament theory. It explains the activities which occur during contraction of muscles.
Muscles are made up of functional units called sarcomeres and these sarcomeres made up of myofibrils which are long and thin strands of protein. Myofibrils contain thin filaments called actin and thick filaments called myosin. Interactions between the thin and thick filaments results in contraction.
The I band contains thin filaments. The H band is the area of no thin filaments. The M line is the midline of the thick filaments. The Z line is the boundary between adjacent sarcomeres and the A band is the area of thick filaments.
Contraction occurs when muscle fibres are activated by neurons through the release of calcium ion. On stimulation, the H and I band get smaller, the zone of overlap gets larger and the Z lines move closer together and the A band remains constant. This the thin filaments slide towards the center resulting in the shortening of the sarcomeres and the muscle fibres as a whole.
Answer:
Fascicles
Explanation:
Fascicles are formed by the connective layer of the perimysium present in the muscle. Fascicles may show different dimensions in the muscles.
Fascicles consists of a bundle of muscle fibers in the muscle. These fascicles regulates the coordination movement of the muscle. Fascicles may increase the muscle fitness.
Thus, the answer is fascicles.
Answer: INTENSITY
Explanation: FITT formula is used for health-related fitness and was designed by The American College of Sport Medicine (ACSM).
FITT is established to put together an efficient workout plan for aspiring to be healthy and healthy individuals.
I stands for Intensity in the FITT principle. Intensity describes the level of difficulty of an exercise. Low intensity level can be adopted at the early stage of an exercise programme and gradually increased to difficult level, in other to avoid burnout.
It is measured based on numbers. The number of sets completed, amount of weight lifted or number of repetitions accomplished, while finding your target heart rate zone and Max heart rate (MHR).