Btec Level 2 Sport Muscular System Practice Test

Antagonistic muscles are muscles that work together to produce a movement and its opposite movement. This means that when one muscle contracts, the other muscle relaxes to allow the desired movement to occur. For example, when the biceps muscle contracts to bend the elbow, the triceps muscle relaxes. This coordinated action of antagonistic muscles allows for smooth and controlled movement. The other options provided do not accurately describe antagonistic muscles.

The deltoid muscle is responsible for extending and elevating the shoulder. It is a large triangular muscle that covers the shoulder joint and allows for movements such as lifting the arm overhead and moving it away from the body. The bicep and tricep muscles are primarily involved in flexion and extension of the elbow, while the abdominals are responsible for core stabilization and trunk movements. Therefore, the deltoid is the correct answer for this question.

Slow twitch oxidative fibers are characterized by their ability to generate energy through aerobic metabolism, which is fueled by oxygen. These fibers are highly resistant to fatigue and are best suited for endurance activities that require low intensity and long duration, such as long-distance swimming. In contrast, high intensity events such as sprinting rely more on fast twitch muscle fibers, which generate energy anaerobically and are better suited for short bursts of intense activity.

During the plank exercise, the muscles are contracted without any change in length, resulting in static tension. This type of contraction is known as isometric contraction. In the plank position, the muscles of the core, including the abdominals, back, and glutes, are engaged to maintain stability and hold the body in a straight line. This sustained contraction without movement helps to strengthen and stabilize the muscles, making it an effective exercise for core strength and endurance.

When a muscle lengthens as it contracts, it is called an eccentric muscular contraction. In this type of contraction, the muscle is actively contracting while also elongating, usually in response to an external force or resistance. This type of contraction is important for controlling movements, decelerating the body, and absorbing shock. Eccentric contractions are known to generate more force than concentric contractions and are commonly used in activities such as lowering weights during resistance training or controlling movements during downhill running.

Tendons are fibrous connective tissues that attach muscles to bones. They are located at each end of every skeletal muscle, serving as a strong connection point between the muscle and the bone it moves. Tendons are essential for transmitting the force generated by the muscle to the bone, allowing for movement and providing stability to the skeletal system.

Smooth muscles are found in the walls of hollow organs, and they are unconsciously controlled. These muscles play a crucial role in controlling bodily functions such as the movement of food, urine, and blood. Therefore, all of the given statements are true about smooth muscles.

Dribbling the ball and making a lay up shot involves the contraction and relaxation of muscles to generate movement. Isotonic muscular contraction refers to a type of muscle contraction where the muscle length changes while maintaining a constant tension. In this case, the muscles involved in dribbling the ball and making a lay up shot are contracting and relaxing to allow for the movement required in these actions, making it an example of isotonic muscular contraction.

The given answer, "Pectorals, Abdominals, Hamstrings," is not different types of muscles within the human body. Pectorals, abdominals, and hamstrings are actually specific muscle groups or muscles, not different types of muscles. Skeletal, smooth, and cardiac muscles are the three different types of muscles found in the human body. Skeletal muscles are attached to the bones and help in voluntary movements. Smooth muscles are found in the walls of organs and blood vessels, and they control involuntary movements. Cardiac muscles are found in the heart and are responsible for its contraction.