Muscle Physiology and Function Concepts

The video tutorial covers the anatomy and function of muscles, focusing on skeletal muscles. It explains the types of muscles, their structure, and the process of muscle contraction involving actin, myosin, ATP, and calcium. The tutorial also discusses energy use in muscles, the role of mitochondria, and the causes of muscle fatigue, including the buildup of lactic acid.

What is the primary function of muscles in the body?

• To store energy

• To produce hormones

• To convert chemical energy into mechanical energy

• To protect internal organs

Which type of muscle is voluntary and has striations?

• None of the above

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

What is the role of the sarcoplasmic reticulum in muscle cells?

• To store oxygen

• To deliver calcium

• To synthesize proteins

• To produce ATP

What is the connective tissue that holds muscles together called?

• Ligaments

• Tendons

• Cartilage

• Fascia

Which type of fascia covers a single muscle cell?

• Perimysium

• Epimysium

• Endomysium

• Subcutaneous fascia

What are the two main proteins involved in muscle contraction?

• Keratin and Fibrin

• Hemoglobin and Myoglobin

• Collagen and Elastin

• Actin and Myosin

What role does ATP play in muscle contraction?

• It provides energy for muscle relaxation

• It binds to actin to initiate contraction

• It detaches myosin from actin and resets the myosin head

• It stores calcium in the sarcoplasmic reticulum

What happens when there is a lack of oxygen in muscles?

• Muscles become stronger

• Muscles increase in size

• Muscles produce more ATP

• Muscles experience fatigue

What is the byproduct of using creatine without oxygen in muscles?

• Lactic acid

• Glucose

• Carbon dioxide

• Water

Why do muscles generate heat during activity?

• Due to the storage of ATP

• Because of increased blood flow

• As a result of energy conversion

• Due to the breakdown of proteins