tudents should be able to explain the roles of thyroxine andadrenaline in the body.

Thyroxine and adrenaline are two important hormones that play crucial roles in the body.

1. Thyroxine: This hormone is produced and released by the thyroid gland, located in the neck. It plays a key role in regulating the body's metabolic rate. This includes how fast calories are burned and how fast the heart beats. A higher level of thyroxine leads to an increased metabolic rate. It also affects the growth and development in children.

2. Adrenaline: This hormone is produced in the adrenal glands, located on top of the kidneys. It is often referred to as the 'fight or flight' hormone because it prepares the body for a sudden burst of energy. When the body perceives a stressful situation, adrenaline is released into the bloodstream. This leads to increased heart rate, increased blood pressure, expanded air passages allowing greater oxygen flow to muscles, dilated pupils, and slowed digestion. This prepares the body to either confront or flee from the threat.

In summary, thyroxine regulates metabolism and growth, while adrenaline prepares the body for stressful situations.