The Muscular System: Ultimate Test! Quiz

The deltoids are the muscles located at the shoulder. They are triangular in shape and cover the shoulder joint. The deltoids are responsible for various movements of the arm, including lifting, rotating, and extending the arm. They are commonly targeted in shoulder exercises to strengthen and tone the shoulder muscles. The pectorals are chest muscles, the trapezius is a large muscle that extends from the back of the neck to the upper back, and the abdominals are the muscles in the abdominal region.

The statement is true because an isometric muscle contraction occurs when the muscle generates tension without changing its length. In a rugby scrum, the players push against each other, creating tension in their muscles without any significant movement. Therefore, the rugby scrum is an example of an isometric muscle contraction.

The hamstrings are responsible for flexing the leg at the knee joint. When a cyclist wants to bend their leg while pedaling, the hamstrings contract, allowing the leg to flex at the knee. The trapezius muscle is located in the upper back and is responsible for movements such as shrugging the shoulders and rotating the shoulder blades. The gastrocnemius muscle is located in the calf and is responsible for plantar flexion of the foot. The quadriceps muscle group is located in the front of the thigh and is responsible for extending the leg at the knee joint.

An isometric muscle contraction refers to a type of muscle contraction in which there is no visible movement or change in the length of the muscle. During an isometric contraction, the muscle generates tension but remains in a fixed position. This type of contraction is commonly used in exercises such as planks or wall sits, where the muscles are engaged but do not produce any movement in the joints. Isometric contractions can be beneficial for building strength and stability in specific muscle groups.

Isometric muscular contractions are contractions that do not result in movement. During isometric contractions, the muscle length remains constant, and there is no visible movement at the joint. This type of contraction is commonly seen in activities such as holding a heavy object in a fixed position or maintaining a static posture.

The deltoids are the correct answer because they are responsible for the abduction of the upper arm at the shoulder. During a dive from the starting blocks, the swimmer needs to move their arms away from the midline of the body, which is the action of abduction. The trapezius, pectorals, and biceps are not primarily involved in this specific movement.

Protein plays a crucial role in repairing muscles when they are injured. When muscles undergo stress or damage, protein helps in the process of repairing and rebuilding the damaged muscle fibers. It provides the necessary building blocks for muscle tissue repair and promotes the synthesis of new muscle proteins. Protein also aids in reducing inflammation and promoting recovery after exercise or injury.

Isotonic muscular contractions are contractions that result in visible movement. This means that the muscle changes in length and there is a visible joint movement. Therefore, the correct answer is False, as isotonic muscular contractions do result in visible movement.

This statement correctly explains the concept of muscle action and antagonistic pairs. When one muscle contracts, the other muscle in the pair relaxes, allowing for movement to occur. The example given, the trapezius and latissimus dorsi, are muscles that work together in this way.

Increased strength of muscles is not a short term effect of exercise on the Muscular System. While exercise can lead to increased strength of muscles over time with consistent and regular training, it is not an immediate or short term effect. Short term effects of exercise on the Muscular System include increased muscle temperature, increased production of carbon dioxide, and increased lactic acid production. These effects occur during and immediately after exercise, while increased muscle strength is a long term adaptation that happens with continued training and progressive overload.

Muscular atrophy is the correct answer because it is not a long-term effect of training on the muscular system. Muscular atrophy refers to the loss of muscle mass and strength, which can occur due to various reasons such as disuse, injury, or certain medical conditions. However, training typically leads to muscular hypertrophy, which is the growth and increase in size of muscle fibers. Increased myoglobin stores and stronger tendons and ligaments are also long-term effects of training on the muscular system, as they help improve oxygen delivery to muscles and enhance overall strength and stability.

The correct answer is "State of slight tension in voluntary muscles." Muscle tone refers to the continuous and partial contraction of voluntary muscles, even when at rest. This slight tension helps maintain posture and stability. It is different from muscle contraction that is controlled consciously, as that refers to intentional movements. Reflex contraction of involuntary muscles is not related to muscle tone, and muscle definition in an elite performer is not a direct description of muscle tone.