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.
What are the 2 classifications of Myofilaments?
- Actin - thin filament and longer
2. Myosin - thick filament and longer
What are the reasons myosin and actin overlap?
- Knot/knoblike calculations on myosin creates cross-bridges on receptors place of actin.
- Sequence of cross-bridges connect and disconnect as actin filaments are drawn inward.
What is Rigor Mortis?
Due to contraction/shrinking of muscles of muscles after death.
What is Creatine Phosphate?
It is used to make sure that there’s enough ATP supply.
What will happen if the request of energy is greater than the ATP supply?
Lactic acid will pile up.
What are Fast Twitch Fibres?
- They are Type 2.
- Less efficient ATP. (anaerobic respiration)
- Breaks down/digests ATP faster.
What are Slow Twitch Fibres?
- They are Type 1
- Increased efficiency/more efficient ATP (aerobic respiration)
- Breaks down/digests ATP slowly/leisurely.
