01:119:116 Lecture Notes - Lecture 12: Endocrine System, Sildenafil, Insulin
5 Apr 2016
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Tissues: groups of cells that are similar in structure and function. Organs: tissues together that function as a unit. All these together form organism via emergent property (whole is greater than parts) Need to exchange with the environment such as: Only then it can move through pm. Things being exchanged can not be dry! To sa : volume ratio in multicellular organism. Ex: if sa : volume ratio is low. Less contact with environment less exchange bad! Internal to the body protected from the. Conformers: allow internal environment to vary with certain external environment changes. Regulators: uses internal mechanism to control internal changes. Always in control regardless of external changes. Needs stimulus = function of variable (ex: temperature) Sensor detects stimulus (something in body detects the stimulus) System goes back to set point (homeostasis) Restore previous steady state back to set point. Ex: contradictions during birth regulated by oxytocin. Using tc"s specific receptors for specific hormones.
