About This Chapter
The Musculoskeletal System - Chapter Summary
In these lessons on the musculoskeletal system, you'll review vocabulary associated with conditions like myasthenia graves and muscular dystrophy. You'll also gain a clearer understanding of striated muscle and common disorders of the skeletal system. By the end of the chapter, you should be ready to:
- Discuss the functions and parts of the axial skeleton and the appendicular skeleton
- Explain joint structures and motion allowed by each type of joint
- Describe skeletal muscle organization
- Recall how thick and thin filaments of a sarcomere interact with each other
- Distinguish differences between red and white muscles
- Explain the nature of a muscle twitch
- List symptoms associated with tetanus
- Detail the stages of rigor mortis
The illustrative teaching style used by our expert educators helps you quickly get up to speed on the musculoskeletal system. A brief quiz is available for each lesson to test your understanding, and you can also contact our instructors with any questions.
1. Axial Skeleton: Functions and Anatomy
Did you know you have two skeletons? Okay, maybe not two full skeletons, but you have two different types of skeletons: the axial and the appendicular skeletons. Learn about the functions and parts of the axial skeleton in this lesson.
2. Appendicular Skeleton: Functions and Anatomy
Without your skeleton, what would you be? Pretty much just a lump of muscle and tissue, right? Learn about the parts of the skeleton responsible for movement in this lesson on the appendicular skeleton.
3. Types of Joints & Joint Structures in the Body
Joints allow you to walk, run, turn your head, and tie your shoes, among many other things. In this lesson, you will learn about the different types of joints and about the motion allowed by each type.
4. Skeletal Muscle Organization: Connective Tissue and Layers
Did you know that skeletal muscles are organized into tightly packed groups? This lesson identifies the connective tissue layers that organize skeletal muscle into fascicles, muscle fibers and myofibrils. Additionally, the microscopic structure of the sarcomere is described.
5. The Sarcomere and Sliding Filaments in Muscular Contraction: Definition and Structures
Did you know that a sarcomere is the fundamental functional unit of striated muscle? This lesson describes the thick and thin filaments of a sarcomere and how they interact with each other to cause sarcomere shortening and muscular contraction.
6. Red Muscles vs. White Muscles
Did you know that you have two main types of skeletal muscles? They are called white muscles and red muscles. Find out what these are, why they're called that, and some of their defining characteristics in this lesson.
7. Muscle Twitch, Wave Summation & Muscle Tension
Did you know that posture results from rapid stimulation of skeletal muscles? This lesson describes the nature of a muscle twitch and explains how individual contractions are added together resulting in tetanus and good posture.
8. Tetanus: Symptoms, Treatment & Prevention
In this lesson, we will discuss a well-known condition called tetanus. You will learn about the bacteria, toxins, and symptoms associated with this deadly disease.
9. Rigor Mortis: Definition, Timeline & Stages
What was the time of death? This is often asked by family members of the deceased after a death investigator completes the initial investigation. One of the most important processes after death is rigor mortis. Learn more about this term, the timeline and its various stages.
10. Common Disorders of the Skeletal System
The skeletal system is a very important body system, and there are some common disorders that specifically affect it. Continue reading to learn about them, including their symptoms and treatment.
11. Vocabulary of Myasthenia Gravis & Muscular Dystrophy
This lesson goes over the basic terminology and definitions of myasthenia gravis and two muscular dystrophies, breaking down the important word parts of these conditions.
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