Cardiac muscle

The tutorial covers cardiac muscle, its development, and its role in the heart. It explains the types of muscle tissue, focusing on cardiac muscle's unique features like cardiomyocytes and intercalated disks. The video also details the heart wall's layers and the function of blood vessels in cardiac health, concluding with a summary of key points.

What type of tissue is cardiac muscle derived from during embryonic development?

• Neural crest

• Ectoderm

• Mesoderm

• Endoderm

Which of the following is NOT a type of muscle tissue found in the human body?

• Smooth muscle

• Skeletal muscle

• Cardiac muscle

• Connective muscle

What is the primary function of sarcomeres in cardiac muscle cells?

• To provide structural support

• To transport nutrients

• To facilitate muscle contraction

• To store energy

How do intercalated disks contribute to the function of cardiac muscle?

• They store calcium ions

• They provide energy for contraction

• They ensure ionic continuity between cells

• They transport oxygen

Which layer of the heart wall is the thickest and primarily composed of cardiac muscle?

• Pericardium

• Endocardium

• Myocardium

• Epicardium

What is the role of the epicardium in the heart wall?

• To pump blood

• To store fat

• To act as a protective layer

• To conduct electrical impulses

Which of the following is a function of the Purkinje fibers in the heart?

• To transport nutrients

• To produce hormones

• To conduct action potentials

• To store oxygen

What is the primary function of the coronary arteries?

• To store nutrients

• To regulate heart rate

• To supply oxygenated blood to the myocardium

• To remove waste products

Which of the following is a common symptom of a myocardial infarction?

• Headache

• Chest pain radiating to the left arm

• Fever

• Rash

What lifestyle change is recommended after a myocardial infarction to reduce the risk of another cardiac event?

• Avoid all medications

• Commit to weight loss and exercise

• Reduce physical activity

• Increase sugar intake