HTHSCI 2L03 Lecture Notes - Lecture 2: Posterior Pituitary, Ovulation, Prostacyclin
9 Oct 2017
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Homeostasis: homeostasis: stable state of equilibrium or tendency towards such state between different but interdependent elements/ groups of elements of an organism, population, or group, aka. *insulin tells body cells & liver to take up glucose; so effectors are really body cells & liver. Ex: uterine contractions in labour: baby pushes on uterine cervix - > receptors: stretch sensitive nerves in cervix -> control centre: hypothalamus -> posterior pituitary releases oxytocin to pituitary portal circulation -> effector: muscles of uterus (myometrium) contract. Stimulus: broken blood vessels with exposed binding sites for platelets (platelets bind to binding sites in blood vessel) Control centre: blood vessels (binding of platelets to blood vessels leads to activation of platelets) things like txa2 & adp, which attract more platelets. Platelets plug up the hole, and growth of clot limited by anticlotting chemicals like pgi2 & absence of binding sites. ***transverse mri images usually taken from the patient"s feet to head*
