Exam 6: The Muscular System

In the lower leg, the gastrocnemius muscle bends the foot away from the knee, as in pointing one's toes. The tibialis anterior muscle flexes the foot toward the knee. These two muscles are

Using the figure above and labels A through D below, identify the structures indicated. -Structure A is a(n) ________.

T, or transverse, tubes in skeletal muscle function to

Isometric contractions usually result in no movement of the skeleton or objects.

To minimize muscle stiffness and soreness, undertake a new exercise activity in ________ for the first few days.

In skeletal muscle, potassium ions are stored in the sarcoplasmic reticulum.

In the absence of ATP, a contracted muscle can't relax.

Match the following muscles to their function. -extends forearm at elbow

According to the sliding filament mechanism, during a muscle contraction, myosin pulls actin filaments toward the center of a sarcomere, causing the entire sarcomere to shorten.

An individual with the condition of myasthenia gravis is faced with an autoimmune disorder in which the body defenses attack acetylcholine receptors on muscle cells. What would be the expected effect on calcium levels near contractile proteins, following the arrival of an electrical impulse at those neuromuscular junctions?

Contraction of a skeletal muscle cell is initiated by the

Match the following muscles to their function. -flexes thigh at the hip; extends leg at knee

Skeletal muscle groups that work together to create the same movement are referred to as

Which one of the following is found within a sarcomere?

Match each disorder or disease of the muscular system with its description. -uncontrolled contraction of muscle, usually after heavy exercise

Plantar fasciitis is an inflammation of the fascia within the sole of the foot, resulting in foot and heel pain. What is a fascia?

Match each disorder or disease of the muscular system with its description. -inflammation of the connective tissue layers surrounding a muscle; common in the sole of the foot

Match the following muscles to their function. -causes lateral rotation of the trunk and abdominal compression

The "all-or-none principle" states that in a given muscle, all of the cells are contracting simultaneously or none of them is contracting.

Muscle cells produce lactic acid when they have an inadequate supply of