1. Unit 2: Support & Movement
Muscle Structure and Function
Chapter 8
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2. Unit 2: Support & Movement
Learning Objectives
To describe the anatomy and histology, including ultrastructure, of muscle tissue SC.912.L (DOK 2) (8.2)
Describe signal transmission across a myoneural junction. SC.912.L (DOK 2) (8.2)
List the steps in the sliding-filament action of muscular contraction SC.912.L (DOK 2) (8.3)
Identify the major muscles of the human on a model or diagram. SC.912.L (DOK 1) (8.8)
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3. Objective: I will describe the structure of skeletal muscle.
Unit 2: Support & Movement
8.2
Aim: How do muscles aid in the overall function of the body’s movement?
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Objective:
I will describe the structure of skeletal muscle.
intro:
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4. Unit 2: Support & Movement
8.2
Aim: How do muscles aid in the overall function of the body’s movement?
AGENDA
Introduction
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Real-world connection
Body Piercings
Vocabulary
Fascia, myosin, actin, sarcoplasm, sarcomere, myofibrils, filaments
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5. Unit 2: Support & Movement
What is Muscle?
Unit 2: Support & Movement
Muscles are the ORGANS that make up the muscular system.
There are three types of muscles:
SKELETAL
SMOOTH
CARDIAC
FUNCTION OF MUSCLE
1. PROVIDE MUSCLE TONE (SUPPORT/POSTURE)
2. PROPEL (MOVE) BODY FLUIDS AND FOOD
3. GENERATE THE HEARTBEAT
4. DISTRIBUTE HEAT
5. MOVEMENT (CONTRACTION) OF BODY PARTS
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6. Unit 2: Support & Movement
Fun Facts
The body has 324 muscles
Muscle is from the Latin word “mus”, meaning “little mouse”
Prefixes: “Myo-” & “Mys-” = Muscle, “Sarco”- Flesh
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7. Characteristics of Muscle
Unit 2: Support & Movement
Characteristics of Muscle
SKELETAL
SMOOTH
CARDIAC
Attached to Skeleton
Hollow Organs (stomach, intestines, bladder, bronchi)
Heart
Multinucleate (many nuclei)
One nucleus
Largest muscle fiber
(30 cm!)
Very fatigue (tiredness) resistant
Striated (“striped”)
Not Striated (smooth!)
Striated & Smooth
Voluntary
Involuntary
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8. Unit 2: Support & Movement
Components of skeletal muscle
d) myofibril c) muscle fiber b) muscle fiber bundle a) Muscle belly
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