Layer C, Task 8 Flashcards
Musculoskeletal System
Organ system made up of bones and skeletal muscle
Purpose of musculoskeletal system
- Supports the body
- Protects delicate organs
- Makes movement possible
What are the 3 types of connective tissue in the skeleton?
- Bones
- Ligaments
- Cartilage
Bone tissue
- Consists of bone cells within a matrix of minerals and collagen fibers
- Small percentage is actually living
What do the canals inside bones contain?
Nerves and blood vessels
Ligaments
- Connective tissues that hold bones together at joints
- Mostly long fibers of collagen
Cartilage
- Dense connective tissue made up of special cells in a matrix of collagen fibers
- Support for bones and other tissues
Skeletal (voluntary) muscle tissue consists of muscle fibers that contain specialized proteins. These proteins…
Cause the muscle to contract when signaled by nerve cells
How is skeletal muscle attached to bones?
By tendons
Role of skeleton
- Provide structure and protection
- Stores calcium + other minerals
- Some bones contain bone marrow (produces red and white blood cells)
How do muscles make bones move?
Each end of skeletal muscle connected by tendons to one or more bones
Muscles contract and exert a force that moves one or both of the bones
Osteoporosis
Loss of bone tissue, makes bones brittle and weak
The musculoskeletal systems of vertebrates vs. invertebrates
Vertebrates (animals w/ backbones) have musculoskeletal systems with muscles attached to bones
Invertebrates have different systems
- Some have no rigid frame (e.g. worms, jellyfish)
- Others have an exoskeleton (skeletal system on the outside)
3 main muscle types that make up the muscular system
- Skeletal muscle (attaches to bones via tendons)
- Cardiac muscle (only found in heart)
- Smooth muscle (lines blood vessels and certain organs)
All 3 muscle types receive signals from the ___________________ that contract the fibres
nervous system
