B5 - Homeostasis and Response

?
View mindmap
  • Hormonal Coordination
    • Hormones (Humans)
      • Chemical molecules sent in the blood to control target organs to produca an effect
      • Secreted by glands
        • Pituitary - "master gland"
          • Secrets hormones that control other glands
        • Pancreas
          • Glucagon
            • Increases blood glucose
            • Conversion of glycogen to glucose stored in the liver and muscles
          • Insulin
            • Conversion of glucose to glycogen to be stored in the liver and muscles.
            • Decreases blood glucose levels
          • Monitors and controls blood glucose levels
            • Control using negative feedback cycle.
          • Diabetes
            • Type 1
              • Disorder
              • Young children
              • Little to no insulin from pancreas
              • Insulin therapy
                • Injections
                  • Very effective
                  • Amount depends on diet and how active person is
                • Limiting intake of carbohydrates
                • Regular exercise
                • Cannot be cured
            • Type 2
              • Older people
              • Resistance to insulin
              • Obesity increses chances
              • Control
                • Exercise
                • Carbohydrate-controlled diet
        • Thyroid
          • Thyroxin
            • Controls metabolism in the body
            • Heart Rate
            • Temperature
        • Adrenal
          • Adrenalin
            • Controls preparation for "fight or flight"
              • Increases heart rate
                • Pumps blood quicker
                  • More oxygen and glucose to brain and muscles
        • Testes(Males only)
          • Testosterone
            • Puberty
              • Causes secondary sex characteristics to develop
                • Facial hair
                • Production of sperm
                • Growth spurt
        • Ovaries(Females only)
          • Oestrogen
            • Puberty
              • Causes secondary sex characteristics to develop
                • Maturation of eggs
                  • Once every 28 days
                    • Ovulation
                • MENSTRUAL CYCLE
                  • FSH
                    • maturation of eggs in ovary
                      • alternates in each ovary every month
                    • Produced in pituitary gland
                    • Stimulates ovaries to produce oestrogen
                  • LH
                    • Stimulates release of egg
                    • Produced in pituitary gland
                  • Progesterone and Oestrogen
                    • Maintaining uterus lining
                    • Oestrogen inhibits production of FSH
                    • Progesterone inhibits production of LH and FSH
                  • Stages
                    • Stage 1 - start - uterus lining breaks down
                      • takes place for 4 days
                      • Day 1- 4
                      • Stage 2 - The uterus lining builds up again with fresh blood vessels ready to receive a mature egg
                        • Day 4 - 14
                        • takes place for 10 days
                        • Stage 3 - An egg develops(matures) and is released(ovulation)
                          • Day 14
                          • takes place for 1 day
                          • Stage 4 - Wall is maintained for fertilised egg to land, if no egg present the lining starts to break down and the cycle restarts.
                            • Day 14 - 28
                            • takes place for 14 days
      • Effects are slower but last longer compared to nervous system
    • Hormones(Plants)
      • Auxin
        • Growth near roots and shoots
        • In response to light
          • Phototropism
            • auxin accumulates on the shady side, causing cells on this side to elongate(grow) faster, so the shoot bends towards the light
        • In response to gravity
          • Geotropism/Gravitropism
            • Unequal distribution of auxin the roots
              • Moe auxin on the lower side
                • Causes lower side to grow faster. making the root bend upwards.
                • Extra auxin inhibits growth
                  • Cells on top can grow faster and cause roots downwards
  • Stage 1 - start - uterus lining breaks down
    • takes place for 4 days
    • Day 1- 4
    • Stage 2 - The uterus lining builds up again with fresh blood vessels ready to receive a mature egg
      • Day 4 - 14
      • takes place for 10 days
      • Stage 3 - An egg develops(matures) and is released(ovulation)
        • Day 14
        • takes place for 1 day
        • Stage 4 - Wall is maintained for fertilised egg to land, if no egg present the lining starts to break down and the cycle restarts.
          • Day 14 - 28
          • takes place for 14 days

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Nervous system, hormones and behaviour resources »