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Muscular dystrophy and what happens to the proteinsactin and myosin?
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What is the function of myosin?
Myosin is responsible for actin-based muscular mobility/contraction.
What is a actin or myosin containing strucutre?
The basic unit of muscular contraction; the sarcomere.
How many types of muscle tissues are there in a muscular system?
Actin and Myosin are the basic muscle tissues.
What is the difference between muscle dystrophy and muscle atrophy?
Myasthenia gravis: autoimmune to the ACh receptors at end plate (pathway >>> no muscle contraction) Muscular Dystrophy: genetic (X-linked) defect in dystrophin (pathway >>> myosin-actin crossbridge doesn't form > no muscle contraction)
What happens to ATP when it binds to Myosin?
Energisation of the head takes place, then cross bridge linkage follows
When myosin cross bridges bind to actin what happens?
Muscle contraction results
What are the proteins are involved in muscle contraction?
Actin and myosin
What protein makes up the thick filaments of myofibrils?
Myosin makes up the THICK filaments, and actin makes up the thin filaments of myofibrils.
What are the thick protein filaments in the cell made of?
The thick filament is composed of the myosin molecule. The thin filament is composed of the actin molecule. Flexing the head of myosin provides the powerstroke.
What myofibril contains only thick myofilaments?
No, myofibrils contain both thick filaments (myosin) and thin filaments (actin) which when activated overlap each other as part of muscular contraction.
What happens when muscles relax?
Relaxation occurs when stimulation of the nerve stops. Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin. Actin and myosin return to their unbound state causing the muscle to relax.
What happens when our muscles relax?
Relaxation occurs when stimulation of the nerve stops. Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin. Actin and myosin return to their unbound state causing the muscle to relax.
