Questions and Answers
What type of movement occurs at the radio-ulnar joint when the forearm turns palm down?
Which muscle group acts as prime movers when extending the arm at the elbow joint?
What happens during dorsiflexion of the ankle joint?
Which of the following movements is classified as lateral flexion?
Signup and view all the answers
Which statement about agonist muscles is true?
Signup and view all the answers
What is the primary function of the skeletal system?
Signup and view all the answers
Which type of joint movement involves a body part moving towards the midline of the body?
Signup and view all the answers
During which type of movement does a joint describe a cone shape?
Signup and view all the answers
What does the structure of a synovial joint primarily allow?
Signup and view all the answers
Flexion of a joint positions a body part in what direction?
Signup and view all the answers
What connective tissue primarily makes up bone?
Signup and view all the answers
Which activity occurs during horizontal flexion at the shoulder joint?
Signup and view all the answers
What are the two main types of the skeletal system?
Signup and view all the answers
Study Notes
Musculo-Skeletal System Overview
- The skeletal system provides body shape, protection for internal organs, and a framework for muscle attachment facilitating movement.
- Comprised of two primary types: appendicular (extremities) and axial (skull, ribcage, vertebral column).
Bones and Cartilage
- Bone structure consists of collagen fibers infused with minerals, primarily calcium salts.
Joints
- Joints connect bones, enabling movement and stabilization.
- Movement is facilitated by the contraction of skeletal muscles across joints, typically with two attachment points on opposite sides.
Movements of Synovial Joints
- Flexion and Extension: Flexion moves a body part forward; extension moves it backward.
- Horizontal Flexion and Extension: Horizontal flexion brings the arm closer to the body; horizontal extension moves the arm away from the body.
- Abduction and Adduction: Abduction moves a body part away from the midline; adduction draws it toward the midline.
- Rotation: Involves turning a body part around its long axis.
- Circumduction: A conical movement where the end of a body part moves in a circular pattern.
- Pronation and Supination: Specific to the forearm; supination occurs in the anatomical position, while pronation refers to rotation inward.
- Lateral Flexion: Bending of the spine sideways, unique to spinal movement.
- Dorsiflexion and Plantar Flexion: Dorsiflexion brings the foot towards the shin; plantar flexion moves the foot away from the shin.
Joint Types and Movements
- Left shoulder: Ball & socket, capable of flexion.
- Right wrist: Condyloid joint, capable of extension.
- Right knee: Hinge joint, allows for extension.
Muscular System Overview
- Muscles are responsible for pulling bones to produce movement, working in pairs to create movement and return to original positions.
- Antagonistic Muscle Action: One muscle contracts (agonist) while its counterpart (antagonist) lengthens to stabilize and facilitate movement.
Muscle Types
-
Agonist Muscles:
- Prime movers (e.g., biceps, hamstrings).
- Contract to produce movement by pulling and shortening during actions.
-
Antagonist Muscles:
- Perform the opposite action of agonists (e.g., triceps to biceps).
- Stabilize movement by lengthening when agonists contract.
Rotator Cuff Muscles
- Key muscles include infraspinatus and subscapularis, crucial for shoulder stabilization and movement.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers Unit 1 of the Musculo-Skeletal System, focusing on the identification of bones and muscles in the human body. Students will analyze how specific muscles contribute to movement at the joints and relate these activities to the overall production of movement patterns. Test your knowledge and understanding of this vital system.
