L 6 MUSCULAR SX PRACTICE EXAM STUDY SET

L 6 MUSCULAR SX PRACTICE EXAM STUDY SET


The main effect of endurance training is an increase in the number of blood vessels in a
muscle. - ANSWER True

When a muscle contracts, its insertion bone moves toward its origin bone - ANSWER
true

Unlike skeletal muscles, smooth muscle cells have only one nucleus. - ANSWER True

Duchenne muscular dystrophy is caused by the body's inability to make the protein
dystrophin. - ANSWER True

Both calcium and ATP are needed for a muscle to contract. - ANSWER True

In bending the elbow, the insertion is in the forearm. - ANSWER True

Tendons attach muscle to bone at both the origin and insertion sites. - ANSWER true

Chemicals are released at the neuromuscular junction that stimulates the muscle to
contract. - ANSWER True

A muscle can be a prime mover or an antagonist depending on the movement of the
joint. - ANSWER True

Shivering helps a person with hypothermia because muscle contractions produce heat.
- ANSWER True

The difference between picking up a 5-pound weight and picking up a 20-pound weight
is the number of motor units stimulating the muscle to contract. - ANSWER True

The thin myofilaments in a skeletal muscle are composed of actin. - ANSWER True

When the elbow is bent, the biceps brachii is the prime mover. - ANSWER True

A football lineman exercises to develop hypertrophy and a marathon runner exercises to
increase blood supply to a muscle. - ANSWER true

In an isotonic contraction, the muscle itself actually shortens. - ANSWER True

Both skeletal muscles and cardiac muscles have striations. - ANSWER True

In an isometric contraction, the muscle does not shorten so there is no tension on the
muscle. - ANSWER false

Muscular dystrophy is a muscle disorder caused by a viral infection. - ANSWER False

When the elbow is bent, the triceps brachii is the prime mover. - ANSWER False

, Both smooth muscles and cardiac muscles have striations. - ANSWER False

Skeletal muscles are also called striated or visceral muscles. - ANSWER False

Both cardiac muscle and skeletal muscles have intercalated disks - ANSWER False

When a person picks up a 5-pound weight, muscle cells contract less forcefully than
when a person picks up a 20-pound weight. - ANSWER False

ATP is produced by muscle contraction. - ANSWER False

In bending the elbow, the insertion is at the shoulder. - ANSWER False

When the elbow is straightened, the triceps brachii becomes the antagonistic muscle. -
ANSWER False

Tendons attach bone to bone. - ANSWER False

The thick myofilaments in a skeletal muscle are composed of actin. - ANSWER false

The main effect of strength training is muscle atrophy. - ANSWER False

Due to its cause, girls are more likely to have Duchenne muscular dystrophy than are
boys. - ANSWER false

Sarcomeres are separated from each other by dark bands called myofilaments. -
ANSWER False

In an isotonic contraction, the origin point moves toward the insertion point. - ANSWER
False

Both cardiac muscle and skeletal muscles have intercalated disks. - ANSWER False

The main effect of endurance training is muscle hypertrophy. - ANSWER False

In the bending of the elbow, the - ANSWER biceps brachii is the prime mover

Another name for visceral muscle is _____ muscle. - ANSWER smooth

In extending the elbow, the - ANSWER triceps brachii is the prime mover

Which type of muscle is characterized by cells with tapered ends and a single nucleus? -
ANSWER smooth

Lifting a book off the desk is an example of what type of contraction? - ANSWER isotonic

Another name for a voluntary muscle is _____ muscle. - ANSWER both a and c

Which substance is stored in the muscle's endoplasmic reticulum and then released
when a nerve signal stimulates a muscle fiber? - ANSWER calcium ions

Trying to lift a 500-pound weight would result in what type of muscle contraction? -