Questions and Answers

Investigate and describe gravitropism and phototropism in shoots and roots

Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light source

Describe the maintenance of a constant internal body temperature in mammals in terms of: insulation, sweating, shivering and the role of the brain 8 Describe the maintenance of a constant internal body temperature in mammals in terms of vasodilation and vasoconstriction of arterioles supplying skin surface capillaries

Outline the treatment of Type 1 diabetes 6 Identify in diagrams and images of the skin: hairs, hair erector muscles, sweat glands, receptors, sensory neurones, blood vessels and fatty tissue

Describe the control of blood glucose concentration by the liver and the roles of insulin and glucagon

Explain the concept of homeostatic control by negative feedback with reference to a set point

State that insulin decreases blood glucose concentration

Describe the role of adrenaline in the control of metabolic activity, limited to: (a) increasing the blood glucose concentration (b) increasing heart rate

State that glucagon is secreted by the pancreas

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 diameter