GCSE Biology - Endocrine System & Hormones #59

The video explains the endocrine system, highlighting its role in body communication through hormones. It covers the main glands, such as the pituitary, thyroid, adrenal glands, pancreas, testes, and ovaries, detailing their functions and hormone production. The concept of negative feedback in hormone regulation is discussed, along with a comparison between the endocrine and nervous systems, emphasizing their differences in speed and precision.

What is the primary role of the endocrine system in the body?

• To transport oxygen in the blood

• To secrete hormones for communication

• To digest food

• To protect against infections

Which gland is known as the 'master gland' and why?

• Adrenal gland, because it controls stress response

• Pituitary gland, because it influences other glands

• Thyroid gland, because it regulates metabolism

• Pancreas, because it regulates blood sugar

How does the thyroid gland respond to low levels of thyroxine?

• It releases adrenaline

• It increases insulin production

• It stops producing hormones

• It is stimulated by TSH to produce more thyroxine

What is the main function of adrenaline in the body?

• To aid in digestion

• To control the menstrual cycle

• To prepare the body for fight or flight

• To regulate blood sugar levels

How do hormones differ from nerve impulses in terms of their action?

• Hormones act quickly and precisely

• Hormones act slowly and generally

• Nerve impulses act slowly and generally

• Nerve impulses act slowly and precisely