Muscle Functions and Actions

This video lecture covers the muscle system, focusing on muscle actions and their importance for lab work. Key terms such as flexion, extension, abduction, and adduction are defined. The lecture explains the typical locations of muscles responsible for these actions, such as flexors on the anterior side and extensors on the posterior side. It discusses the roles of abductors and adductors, as well as the relationships between agonist and antagonist muscles. Additionally, the lecture covers the roles of synergists and fixators in muscle actions, emphasizing their importance in providing stability and assisting primary movements.

What is the primary focus of the muscle system lecture?

• Understanding muscle names only

• Learning about muscle actions

• Studying the nervous system

• Memorizing bone structures

Which term describes decreasing the angle at a joint?

• Adduction

• Abduction

• Flexion

• Extension

Where are muscles that flex body parts typically located?

• On the anterior side

• On the medial side

• On the lateral side

• On the posterior side

What action does the deltoid muscle perform?

• Extension of the arm

• Flexion of the arm

• Abduction of the arm

• Adduction of the arm

Which muscle is responsible for adducting the humerus?

• Trapezius

• Deltoid

• Biceps Brachii

• Teres Major

What term describes muscles that perform opposite actions?

• Synergists

• Fixators

• Antagonists

• Agonists

In arm flexion, which muscle acts as the agonist?

• Triceps Brachii

• Deltoid

• Biceps Brachii

• Latissimus Dorsi

What role does the brachioradialis muscle play in arm flexion?

• Fixator

• Synergist

• Antagonist

• Agonist

Which muscles are known for stabilizing the shoulder joint?

• Biceps Brachii

• Pectoralis Major

• Rotator Cuff Muscles

• Trapezius

What is the primary function of fixator muscles?

• To perform the main action

• To oppose the main action

• To assist the main action

• To stabilize joints