L2 A&P YMCA

Which energy system will be used maximally during a 50m sprint

• Lactic Acid System

• Aerobic System

• Adenosine Diphosphate System

• Creatine Phosphate System

Answer explanation

During a 50m sprint, the body relies primarily on the Creatine Phosphate System for quick energy. This system provides immediate energy for short bursts of high-intensity activity, making it the most utilized during such a sprint.

What classification is given to a joint that is slightly moveable?

• Fibrous

• Cartilaginous

• Synovial

• Fused

Answer explanation

A cartilaginous joint allows for slight movement, unlike fibrous joints which are immovable and synovial joints which are freely movable. Therefore, the correct classification for a slightly moveable joint is cartilaginous.

Which of the following is NOT a function of the pelvic floor muscles

• Assist in urinary continence

• Aid sexual performance

• Support pelvic floor organs

• Assist in spine extension

Answer explanation

The pelvic floor muscles assist in urinary continence, aid sexual performance, and support pelvic organs. However, they do not assist in spine extension, which is primarily the function of the back muscles.

What type of joint allows abduction

• Ball and socket

• Pivot

• Gliding

• Hinge

Answer explanation

The ball and socket joint allows for a wide range of motion, including abduction, which is the movement of a limb away from the midline of the body. This is seen in joints like the shoulder and hip.

Which of the following describes the process of gas exchange in the lungs

• Oxygen in the alveoli is exchanged for carbon dioxide in bronchioles

• Oxygen in the alveoli is exchanged for carbon dioxide in blood capillaries

• Oxygen in blood capillaries is exchanged for carbon dioxide in bronchioles

• Oxygen in blood capillaries is exchanged for carbon dioxide in alveoli

Answer explanation

Gas exchange occurs in the alveoli, where oxygen from the alveoli enters the blood capillaries, and carbon dioxide from the blood is released into the alveoli to be exhaled. Thus, the correct choice is oxygen in the alveoli is exchanged for carbon dioxide in blood capillaries.

According to the all or non principle, the strength of the muscle contraction is determined by..

• The number of motor units innovated

• Hyperplasia

• Hypertrophy

• Hooke's law

Answer explanation

According to the all or none principle, muscle contraction strength is determined by the number of motor units activated. More motor units lead to a stronger contraction, while fewer units result in a weaker contraction.

What is an osteoclast?

• A cell from which bone develops

• A type of bone cell responsible for bone formation

• A type of bone cell that is mature

• A type of bone cell responsible for removing bone tissue

Answer explanation

An osteoclast is a type of bone cell responsible for removing bone tissue, playing a crucial role in bone remodeling and maintaining bone health.

Why is fluid intake important in the digestive process

• To assist with digestion of food

• To regulate blood pressure

• To help prevent constipation

• To reduce chemical processes

Answer explanation

Fluid intake is crucial for preventing constipation by softening stool and promoting regular bowel movements, making it easier to pass. This helps maintain digestive health and overall well-being.

Which of the following is a function of skeletal muscle

• Works with cartilage to provide joint stability

• Contracts to assist peristalisis

• Relaxes to assist peristalisis

• Works with ligaments to provide joint stability

Answer explanation

Skeletal muscle works with ligaments to provide joint stability by contracting and maintaining posture, which is essential for joint support. The other options relate to smooth muscle functions, not skeletal muscle.

Which of the following muscles is positioned on the anterior of the femur

• Hamstring

• Tibialis Anterior

• Gastrocnemius

• Quadriceps

Answer explanation

The quadriceps muscle group is located on the anterior (front) side of the femur, responsible for knee extension. In contrast, the hamstrings are on the posterior, tibialis anterior is on the lower leg, and gastrocnemius is also posterior.