L 6 Muscular Sx PRACTICE

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

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.

True

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

True

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

True

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

True

When the elbow is bent, the biceps brachii is the prime mover.

True

Which type of muscle tissue specializes in contraction or shortening?

all of the above

Endurance training results in

an increase in blood vessels to a muscle

The origin of a muscle is the

attachment to the more stationary bone

In the bending of the elbow, the

biceps brachii is the prime mover

Another name for a voluntary muscle is _____ muscle.

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?

calcium ions

Intercalated disks are found in _____ muscle.

cardiac

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

false

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

false

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

false

Muscle hypertrophy

is an increase in muscle size

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

isometric

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

isotonic

If the muscles of a weightlifter and a marathon runner were compared, the weightlifter would have

larger muscle cells

Which of the following is not a primary function of the muscular system?

protection of internal organs not protected by bone

Which type of muscle tissue contains striations?

skeletal muscle

Another name for visceral muscle is _____ muscle.

smooth

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

smooth

In extending the elbow, the

triceps brachii is the prime mover

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

true

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

true

When a muscle contracts, its insertion bone moves toward its origin bone

true

ATP is produced by muscle contraction.

False

Both cardiac muscle and skeletal muscles have intercalated disks

False

Both cardiac muscle and skeletal muscles have intercalated disks.

False

Both smooth muscles and cardiac muscles have striations.

False

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

False

In bending the elbow, the insertion is at the shoulder.

False

Muscular dystrophy is a muscle disorder caused by a viral infection.

False

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

False

Skeletal muscles are also called striated or visceral muscles.

False

Tendons attach bone to bone.

False

The main effect of endurance training is muscle hypertrophy.

False

The main effect of strength training is muscle atrophy.

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.

False

When the elbow is bent, the triceps brachii is the prime mover.

False

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

False

1. one of the three layered muscles on the side of the abdominal wall 2. primary calf muscle 3. muscle group made up of the rectus femoris and the three vastus muscles 4. muscles that are located between the ribs 5. muscle located on the front surface of the lower leg 6. group of muscles that includes the biceps femoris 7. muscle that makes up much of the substance of the buttock 8. strap-shaped muscle that runs down the center of the abdomen

1. external oblique 2. gastrocnemius 3. quadriceps 4. intercostal muscles 5. tibialis anterior 6. hamstring muscles 7. gluteus maximus 8. rectus abdominis

1.muscle on the back of the upper arm that is responsible for elbow extension 2.large fan-shaped muscle that covers the upper chest 3.one of the muscles used to close the jaw 4.pair of muscles that allow a person to flex the head to the chest 5.can be referred to as the "smiling muscle" 6. 7.muscle on the front of the upper arm responsible for flexion of the elbow 8.large muscle on the lower back

1. triceps brachii 2. pectoralis major 3. masseter 4. sternocleidomastoid 5. zygomaticus 6. deltoid 7. biceps brachii 8. latissimus dorsi

1. another term for skeletal muscle 2. another name for smooth muscle 3. structures that are found only in cardiac muscle 4. usually the nonmoving attachment point of a muscle 5. functional unit of contraction of a skeletal muscle 6. usually the moving attachment point of a muscle 7. protein that makes up the thin myofilament 8. structures that separate one sarcomere from another 9. a small fluid-filled sac that lies between some tendons and bones 10. protein that makes up the thick myofilament

1. voluntary muscle 2. visceral muscle 3. intercalated disks 4. origin 5. sarcomere 6. insertion 7. actin 8. Z line 9. bursae 10. myosin

#1 is pointing to the 6 #2 is pointing to the 1 #3 is pointing to the 3 #4 is pointing to the 5 #5 is pointing to the 4

1.Deltoid 2.Tricpes Brachii 3.Pectoralis major 4.External oblique 5.Rectus abdominus 6.Biceps brachii

#1 is pointing to 2 #2 is pointing to 3 #3 is pointing to 4 #4 is pointing to 5 #5 is pointing to 6

1.Sternocleidomastoid 2.Trapezius 3.Deltoid 4.Triceps brachii 5.Gluteus maximus 6.Latissmus dorsi

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

True

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

True

Both skeletal muscles and cardiac muscles have striations.

True

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

True

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

True

In an isotonic contraction, the muscle itself actually shortens.

True

In bending the elbow, the insertion is in the forearm.

True