5.3 Exercises for Lesson 5

1. The main types of tissues in skeletal muscles are and
.

2. The large portion of a skeletal muscle is known as its or its . Generally, a skeletal muscle is attached to bone by a
or . If the fleshy portion is directly connected to the bone, it is called a .

3. What is a neurovascular bundle?

What is a motor point?

What is a motor unit?

4. The trunk musculature is arranged in two ways-- muscles and muscles. The limb musculature is arranged around the to provide the appropriate motions of the .

5. Label the drawings below according to class of lever.

6. The components of a skeleto-muscular unit are:

a. .

b. .

c. .

7. The muscle which makes the main effort for a given motion is called the
. A muscle which assists the first is called a . A muscle which applies a force opposite to that of the first is called an .

Answers to Exercises for Lesson 5

1. The main types of tissues in skeletal muscles are striated muscle fibers and fibrous connective tissue. (para 5-2)

2. The large portion of skeletal muscle is known as its belly or fleshy belly.
Generally, a skeletal muscle is attached to bone by a tendon or aponeurosis. If the fleshy portion is directly connected to the bone, it is called a fleshy attachment. (para 5-2a)

3. A neurovascular bundle is a branch from the main NAVL, sheathed in fibrous connective tissue. The motor point is the specific location on the surface of the muscle where the neurovascular bundle enters. A motor unit is a single motor neuron and the striated muscle fibers activated by the neuron. All fibers of a motor unit contract or none contract. (para 5-2b)

4. The trunk musculature is arranged in two ways--longitudinal muscles and oblique muscles. The limb musculature is arranged around the joints to produce the appropriate motions of the limbs. (para 5-4)

5. a. Third class.
b. First class.
c. Second class. (para 5-6; figure 5-3)

6. The components of a skeleto-muscular unit are:

a. Bones.
b. Joint (articulation).
c. Skeletal muscles. (para 5-8)

7. The muscle which makes the main effort for a given motion is called the prime mover (agonist). A muscle which assists the first is called a synergist. A muscle which applies a force opposite to that of the first is called an antagonist.
(para 5-8c)