Muscle contraction Flashcards
At any given time muscles are stimulated while other aren’t this causes tightened firmed muscle
Muscle tone
Types of muscle contractions
Isotonic and isometric contractions
What is an istotonic contraction
Same tone or tension and myofilaments are successful in their sliding movements the muscle shortens and movement occurs
What is an isometric contraction
Same measurement and tension of muscle keeps increasing but no movement happens
When a muscle loses its ability to contract during strenuous exercise it is referred to as what?
Fatigue
What prevents a muscle from contracting
Lowered pH as a result of accumulated lactic acid
How does a muscle cramp occur
Lack of ATP required to return calcium ions back to sarcoplasmic reticulum so muscle fibers can relax
When may oxygen deficiency occur
Strenuous exercise and lactic acid accumulates as an end product of anaerobic respiration
What stores oxygen in muscle tissue
Pigment myoglobin
What carries oxygen to the muscle
Hemoglobin in red blood cells
When is the complete breakdown of glucose enabled in the mitochondria
Early phase of cellular respiration
Energy for contraction comes from the molecules of what
Atp
What stores energy release by the mitochondria
Creatine phosphate
As atp decomposes what happens
Energy from creatine phosphate can be transferred to ADP molecules converting them back to ATp
What is a motor unit
A motor neuron and muscle fibers it controls
What does a motor unit do
When told to do so muscle fibers of motor unit contract all at once
