B5 homeostasis and response

• Homeostasis is the maintenance of a constant internal environment despite changes in the external environment.
• Homeostasis includes the controls of

  • blood glucose. concentration.
  • body temperature.
  • water levels.
• Reflex arc

  • Receptor in the skin detects a stimulus (the change in temperature).
  • Sensory neurone sends electrical impulses to relay neurone. Relay neurones are located in the spinal cord. ... 
  • Motor neurone sends electrical impulses to an effector.
  • Effector produces a response (muscle contracts to move hand away).
• The endocrine function is to control the release of hormones from the endocrine glands to the blood stream
• The pituitary gland is located in the brain that regulates growth, metabolism, and reproduction through the hormones that it produces
• The central nervous system is the brain and the spinal cord. The central nervous system's responsibilities include receiving, processing, and responding to sensory information.
• Hormones travels around the body in the bloodstream and binds to receptors on target cells
• GLUCAGON’S role in the body is to prevent blood glucose levels dropping too low
• When the body needs a quick boost of energy or when the body isn't getting glucose from food, GLYCOGEN is broken down to release glucose into the bloodstream to be used as fuel for the cells
• the role of insulin is to regulate the body's energy supply by balancing blood sugar levels
• The role of glucose in the body is to provide energy for the body
• Phototropism is the growth of a plant in response to light.
• Auxin is the hormone that controls growth at the tips of shoots and roots of plants
• Muscles and glands are examples of effectors
• The nervous system means that humans can react to their surroundings and coordinate their behaviour
• Reaction time is the time it takes for a person to respond to a stimulus.
• Chemicals diffuse across the synapse and set off a new electrical impulse in the next neurone
• Alcohol is a depressant Which means it reduces the effectiveness of neutrons signalling. The effect of this is reaction time will be slower because the nerve signals take longer to transmit around the body, so the response will take longer
• The cerebellum responsible for muscle coordination
• hormones are transported around be body in the blood
• The endocrine system is a complex network of glands and organs. It uses hormones to control and coordinate your body's metabolism, energy level, reproduction, growth and development, and response to injury, stress, and mood
• Pancreas is the gland that monitors and controls blood glucose concentration
• Type one diabetes is where the pancreas produce Little to no insulin.