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The pineal gland is responsible for regulating sleep-wake cycles. 

What is the main function of macrophages in the immune system?

Cardiac muscle cells are multinucleated like skeletal muscle cells.  

Which gland is known as the “master gland” of the endocrine system?

What is the primary function of intercalated discs in cardiac muscle?

Explain how negative feedback mechanisms regulate hormone levels in the body, providing specific examples.

Describe the inflammatory response.

Viruses and bacteria have an effect on the functioning of the immune system; tabulate any two differences between viruses and bacteria.

Which of the following is a part of the body’s innate immune system?

What is the primary function of the Thymus gland?