Muscular System

Front

The outermost layer of connective tissue of a muscle is the:

Back

epimysium.

Front

The thick myofibril filament of a sarcomere is composed of a protein:

Back

myosin

Front

The muscle primarily responsible for a movement is the:

Back

prime mover (agonist)

Front

The neuron and the collection of muscle fibers it innervates is called the:

Back

motor unit.

Front

The functional contractile unit within muscle fiber is the:

Back

sarcomere.

Front

The functional contractile unit within muscle fiber is the:

Back

sarcomere

Front

According to the sliding filament model, muscle contraction begins when:
Options: calcium ion concentration increases exposing binding sites., myosin heads pull on actin filaments., ATP splits to form ADP and P., myosin heads release the actin filaments.

Back

calcium ion concentration increases exposing binding sites.

Front

Cardiac muscle

Back

contracts as a syncytium, excites itself, is only in the heart

Front

Oxygen debt in muscles may develop because of:

Back

the inability of respiratory and circulatory systems to supply enough oxygen to skeletal muscles when used strenuously for a minute or two.

Front

A weightlifter uses muscles so the muscles exert more than 75% of their maximum tension, this stimulates:

Back

muscle fibers developing new filaments of actin and myosin.