What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.14.3.1Hormone as a chemical substance• Describe a hormone as a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organsSyllabus objective14.3.2Specific endocrine glands and state• Identify in diagrams and images specific endocrine glands and state the hormones they secrete, limited to: (a) adrenal glands and adrenaline (b) pancreas and insulin (c) testes and testosterone (d) ovaries and oestrogenSyllabus objective14.3.3Adrenaline as the hormone secreted• Describe adrenaline as the hormone secreted in ‘fight or flight’ situations and its effects, limited to: (a) increased breathing rate (b) increased heart rate (c) increased pupil diameterSyllabus objective14.3.4Nervous and hormonal control• Compare nervous and hormonal control, limited to speed of action and duration of effectSyllabus objective14.3.5Glucagon is secreted by the pancreas• State that glucagon is secreted by the pancreasSyllabus objective14.3.6Role of adrenaline in the control• Describe the role of adrenaline in the control of metabolic activity, limited to: (a) increasing the blood glucose concentration (b) increasing heart rateSyllabus objective