2.83 Describe how responses can be controlled by nervous or by hormonal communication and understand the differences between the two systems

Endocrine (hormonal) system

• Long lasting response
• Widespread effect
• Hormones produced all over the body, carried by plasma
• Pituitary gland and hypothalamus are key players

Nervous

• Short lived but very quick
• Localised; specific to an area
• Often involves the contraction of a muscle