A&P I Lab | Exercises 8 & 9: Muscle Terminology, Movements, and Muscle Tension Factors

The video tutorial by Kevin Tolkoff covers Exercise 7, focusing on skeletal muscles. It explains the types of muscles, their attachments, and how they generate movement. The tutorial delves into muscle roles such as agonist, antagonist, and synergist, and classifies muscles based on fiber orientation and shape. It also describes major joint movements and how muscle force varies with stimulation frequency and intensity.

What is the primary function of skeletal muscles?

• To digest food

• To produce hormones

• To facilitate movement by pulling on bones

• To pump blood throughout the body

What is the term for the point of attachment of a muscle that remains stationary during contraction?

• Synergist

• Antagonist

• Origin

• Insertion

Which muscle is considered the antagonist of the gastrocnemius during plantar flexion?

• Soleus

• Tibialis anterior

• Biceps brachii

• Rectus femoris

What type of muscle fibers run parallel to each other?

• Pennate

• Fusiform

• Convergent

• Parallel

Which muscle type is characterized by fibers that converge to a single point?

• Convergent

• Fusiform

• Circular

• Parallel

What is the movement called when a limb is moved away from the midline of the body?

• Extension

• Flexion

• Adduction

• Abduction

In which plane do flexion and extension movements occur?

• Transverse

• Oblique

• Sagittal

• Frontal

What happens to muscle tension when the frequency of electrical stimulation is increased?

• Tension fluctuates randomly

• Tension remains the same

• Tension decreases

• Tension increases

What is the term for the maximum force generated by a muscle when the stimulation intensity is increased beyond a certain point?

• Threshold stimulus

• Subthreshold stimulus

• Wave summation

• Maximal stimulus

What is the term for a small contraction of a muscle in response to a single electrical stimulus?

• Tetanus

• Wave summation

• Muscle twitch

• Synergist action