Muscle Anatomy and Physiology Concepts

Muscles are working in your body even when you are asleep and still.

• True

• False

Muscles contract when

• thin filaments slide past thin filaments

• thick filaments slide past thick filaments

• thin filaments slide past thick filaments

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

• actin.
• myosin.
• sarcolemma.
• titin.

What type of muscle tissue is found in the heart?

• skeletal

• smooth

• cardiac

• voluntary

The thick filament is composed of: 

• Myosin
• Actin

__________ from myosin filaments latch onto the ________ filaments. Their union causes muscles to contract.

• actin, globular heads

• G-actin, F-actin

• globular heads, actin

• F-actin, G-actin

Chest and shoulder muscles that move the arm at the shoulder joint have insertions on the:

• humerus.
• scapula.
• clavicle and ribs.
• radius or ulna.

__________________ anchors the the muscle to bone

• aponeurosis

• fascia

• tendons

• ligament

How do pairs of skeletal muscles work together?

• while one contracts, the other returns to original length
• both muscles contract at the same time
• both muscles relax at the same time
• 1 muscle pulls on the bone and the other pulls on the first muscle

Smooth Muscle is found in the?

• Heart

• Facial

• Organs

• Legs