PLG Muscle Physio Quiz

Tendons connect

• Muscle to Muscle

• Muscle to Bone

• Muscle to Ligament

• Bone to Bone

The H zone in a myofibril contains

• thick and thin filaments

• thick filaments only

• thin filaments only

• no filaments

Ligament are typically found between:

Troponin and Tropomyosin are examples of:

• Contactile Proteins

• Structural Proteins

• Regulatory Proteins

In a skeletal muscle, a triad which is located at the A-I junction is comprised of:

In smooth muscle, contactile proteins are present but not arranged into sarcomeres

• True

• False

The four steps of the contraction cycle in the correct order are:

• ATP Hydrolysis, Formation of cross-bridges between actin and myosin, Power Stroke, Detachment of myosin from Actin

• ATP Hydrolysis,

  Power Stroke, Formation of cross-bridges between actin and myosin, Detachment of myosin from Actin

• ATP Hydrolysis, Detachment of myosin from Actin, Power Stroke, Formation of cross-bridges between actin and myosin

• Power Stroke, Formation of cross-bridges between actin and myosin, Detachment of myosin from Actin, ATP Hydrolysis

Which graph depicts an instance where a muscle is continuously stimulated at a high enough frequency and the individual twitches summate to produce a complete sustained contraction?

• 1

• 2

• 3

• 4

The four factors which determine the strength of skeletal muscle contraction are

1. Metabolic Conditon

2. Amount of Load

3. Recruitment of motor units

4. _______________

In cardiac muscle, the intercalated discs contain desmosomes and gap juntions. What are the functions are each of these components?