Muscle Fibre Types - Red and White

Muscle Structure and Function

• The 'M' line in the myofibril is where myosin thick filaments are anchored.
• The striated appearance of the myofibril is due to the regular arrangement of sarcomeres.
• A sarcomere is the functional unit of the myofibril, containing actin and myosin filaments.
• Oxidative muscle fibers contain plenty of mitochondria for ATP production.
• Actin and myosin filaments slide past each other, causing muscle contraction.
• Anaerobic muscle fibers depend on anaerobic processes for energy.

Skeletal System

• The human skull consists of 22 cranial bones.
• The primary role of the skeletal system is to provide support and protection for the body.
• The mandible bone is present at the base of the buccal cavity and is part of the skull.
• The axial skeleton in human beings consists of 80 bones.
• The front part of the skull in the facial region is formed by 14 skeletal elements.
• The atlas bone articulates with the occipital condyles.
• During muscle contraction, the shortening of the sarcomere is caused by the sliding of actin and myosin filaments.
• Repeated muscle activation leads to the accumulation of lactic acid in muscles.
• Myoglobin in muscles stores oxygen for later use.
• Muscle relaxation occurs when the 'Z' lines return to their original position, which is caused by the release of calcium ions.

This quiz covers the different types of muscle fibers, namely red and white fibers, and their characteristics. It explains the presence of mitochondria, myoglobin, and the reliance on aerobic or anaerobic processes in these muscle fibers.