Chapter 9: 9.4 - Muscles Flashcards
What are the 3 classifications of muscles?
- Cardiac muscle
- Smooth muscle
- Skeletal muscle
What are the functions of cardiac muscle?
- They are the muscle of the heart
- Involuntary
- The muscle contracts, is calm automatically
- Directed by nerves of autonomic nervous system
- Striated: Narrow of slim stripes or bands which are visible under a microscope.
What are the functions of the smooth muscle?
- Located in the lining of several organs: stomach, esophagus, uterus, walls of blood vessels
- Involuntary
- Unstriated
What are the functions of the skeletal muscle?
- Voluntary
- These muscles permit you to walk and talk
- Are connected to bones by the tendons
- Permits movement, smiling, tutelage of body warmth.
- 80% of energy utilized in skeletal muscle contraction is lost as heat.
What are Antagonistic Muscles?
Several skeletal muscle are organized in pairs which work against each other to make a joint move.
What happens when biceps contract?
Triceps relax
- The bones creating the elbow linked and escorted in close proximity together.
What happens when biceps relax?
Triceps contracts
- 2 biceps proceed separately.
Flexors mean?
The muscle which must contract/shrink to curve a joint/linkage.
Extensors mean?
The muscle which must contract to arrange/straighten a linkage.
What is the Central Nervous System?
makes sure that the biceps and triceps do not make an effort to tug or pull against each other.
What is Excitatory Nerve Impulses?
The purpose of this is that it helps by assisting triceps to shrink/contract.
What is Inhibitory Nerve Impulses?
The purpose of this is that it helps by assisting biceps to calm down/relax.
What is the function of the Skeletal Muscle?
- Permits movement, smiling, keeping body warm.
- 80% of energy utilized in skeletal muscle contraction is lost as heat.
What is Sarcolemma?
Encased or enclosed within a membrane.
What is Myofilaments?
A filament of contractile proteins located within the muscle fibres.
