Ch 10 And 11 Muscular System (up To Pg 4 Of Ch 11)

Contraction happens at the myofibril level within muscle cells, not at the cellular, tissue, or organ level.

Endomysium is a connective tissue sheath that surrounds individual muscle fasicles, providing support and allowing for coordinated movement.

Tendons or aponeuroses are the correct answer because they are the structures that connect muscles to bones or other muscles. Ligaments connect bone to bone, cartilage is a type of connective tissue, and bursae are small fluid-filled sacs that reduce friction between tissues.

Satellite cells are not involved in transmitting electrical signals, controlling muscle contractions, or producing energy for muscle contractions. Their primary function is in the repair of damaged muscle tissue.

Endomysium is a layer of connective tissue that surrounds individual muscle fibers within a muscle. Its main function is to hold the muscle fibers together and provide structural support.

Satellite cells are typically found within muscle cells, specifically between the basal lamina and the sarcolemma. They play a crucial role in muscle repair and regeneration.

Satellite cells are small, purple-stained cells located on the outer surface of muscle fibers and are involved in muscle repair and regeneration.

Myofibrils are the contractile units of muscle cells, responsible for muscle contraction. In this case, the muscle cell has 15 myofibrils, which are being referred to humorously as 'Slim Jims' in the question.

Active muscles require more ATP producing mitochondria to support increased energy demands during activity.

Muscle fibers contain various structures essential for muscle contraction and function, including components like sarcolemma, sarcoplasm, myofibrils, multiple nuclei, repair by fibrosis, mitochondria, sarcoplasmic reticulum, terminal cisternae, T tubules, and triad. The incorrect answers do not accurately represent the components of muscle fibers.

The sarcolemma refers to the plasma membrane of the muscle fiber, which plays a crucial role in muscle contraction and communication between cells.

Sarcoplasm refers to the cytoplasm of muscle fibers, where various organelles and proteins essential for muscle function are located.

Myofibrils are long protein bundles that play a crucial role in muscle contraction, not to be confused with other structures such as short muscle fibers, blood vessels, or fluid-filled sacs.

The multiple nuclei of muscle cells are flattened against the sarcolemma or plasma membrane to efficiently control cellular functions.

The correct explanation is that skeletal muscle is composed of fused stem cells, myoblasts, and satellite cells, each contributing to the presence of multiple nuclei in muscle fibers.

Movement is considered fundamental to all living things as it is essential for various biological processes and survival.

Muscle cells convert ATP, a form of chemical energy, into mechanical energy to facilitate muscle contraction.

Muscles in the human body can be categorized into three main types: skeletal muscles which are attached to bones and responsible for voluntary movement, cardiac muscles found in the heart that help pump blood, and smooth muscles that control involuntary movements in organs like the stomach and intestines.

Skeletal muscle is responsible for various functions such as providing strength, endurance, quickness, and the basis of warm-up and fatigue. It is not involved in regulating body temperature, pumping blood, or aiding in digestion.

The correct characteristics of muscle are responsiveness, conductivity, contractility, extensibility, and elasticity. Rigidity, durability, flexibility, and density are not accurate characteristics of muscle tissue.

The 5 characteristics of muscle are responsiveness (excitability), conductivity, contractility, extensibility, and elasticity. Strength, flexibility, endurance, and agility are related but not the characteristics being asked for.

Muscles play a crucial role in various bodily functions including movement, stability, control of openings and passageways, and heat production.

Our muscles regulate about 85% of body heat, making them a key factor in regulating our internal temperature.

Skeletal muscle is voluntary and striated, as opposed to smooth muscle which is involuntary. It is specifically attached to bones for movement.

Striations refer to the alternating light and dark transverse bands that result from an overlapping of internal contractile proteins.

The term 'voluntary' typically implies actions that are done intentionally and with conscious control, rather than automatically or due to external pressure.

A muscle cell is commonly referred to as muscle fiber or myofiber and generally measures about 30 cm in length. The incorrect answers do not accurately describe the characteristics of a muscle cell.

In a muscle, the largest unit is the muscle itself (e.g. gastrocnemius), followed by fasicles bundled together by perimysium, then myofibers bundled together by endomysium, then bundles of myofibrils, and finally myofilaments as the smallest units. The incorrect answers provided do not accurately depict the hierarchical structure of a muscle.