common exam questions

• reigion in the CNS responsible for vision?

  cerebrum
• Axon carries information along neurones as?

  electrical impulses
• describe the role of myelin sheath around the axon?

  insulates the electrical impulses, speeds up transmittion
• describe the route of impulse on the reflex arc (rsrsme)?

  receptor detects stimulus, sends electrical impulse along the sensory neurone, moves to relay neurone by a synapse, travels through spinal cord and moves to motor neurone, moves to effector and starts response
• The function of synapses in neuronal communication is to transmit signals between neurons, allowing for the transfer of information in the brain and nervous system.
• sweat glands in thermoregulation?

  sweat glands release water to skin surface, water evaporates and loses heat
• why do you use a control experiment?

  to compare experiment results with or to see what normally happens
• method to show auxins are in the tip of the shoot?

  cut of one tip and leave the other = measure the change in growth and direction of movement
• why is there a wide range of ADH levels in people?

  hydration levels, salt intake, drug influence
• how does the body respond to an external temperature of 40 degrees?

  homeostasis, vasodilation, sweat increase, BV widen in diameter near skin, more heat loss via radiation, blood close to skin = heat loss, hair follicles lay flat on skin = no trapped heat