Quiz on Cardiac Muscle Properties

What is the primary function of cardiac muscle?

• To facilitate voluntary movement

• To pump blood throughout the body

• To support skeletal structure

• To aid in digestion

Which property allows cardiac muscle to generate its own electrical impulses?

• Autorhythmicity

• Elasticity

• Contractility

• Conductivity

What structure connects cardiac muscle cells and facilitates rapid electrical communication?

• Myofibrils

• T-tubules

• Intercalated discs

• Sarcoplasmic reticulum

Which ion plays a critical role in cardiac muscle contraction?

• Chloride

• Calcium

• Potassium

• Sodium

What is a key difference between cardiac muscle and skeletal muscle?

• Cardiac muscle is multinucleated

• Cardiac muscle has intercalated discs

• Cardiac muscle is found in limbs

• Cardiac muscle is voluntary

What condition is characterized by irregular electrical activity in the heart?

• Heart failure

• Atrial fibrillation

• Myocardial infarction

• Hypertension

What is the role of calcium during cardiac muscle contraction?

• It promotes relaxation

• It has no role

• It triggers contraction

• It inhibits contraction

Which of the following is a clinical application of understanding cardiac muscle properties?

• Treating infections

• Diagnosing arrhythmias

• Managing diabetes

• Improving lung function

What type of muscle is cardiac muscle classified as?

• Involuntary muscle

• Voluntary muscle

• Smooth muscle

• Skeletal muscle

What is the effect of beta-blockers on the heart?

• Block calcium channels

• Increase heart rate

• Reduce heart rate and contractility

• Enhance contractility