BIOL 201 Lecture Notes - Lecture 21: Myelin, Reproductive System, Endocrine System
7 Apr 2018
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It keeps produ(cid:272)i(cid:374)g progesterone and estrogen, not permitting production of fsh and lh and maintaining the pregnancy: first few months: embryo, second trimester: fetus, third trimester: almost an actual human about to be born. Lh, which also have cells with receptors, triggers these cells to produce the hormone testosterone: testosterone also signals the start if spermatogenesis. Inside the neurone, relati(cid:448)e to the outside, there"s a (cid:374)egati(cid:448)e ele(cid:272)tri(cid:272) (cid:272)harge, a high concentration of potassium (k+) and a low concentration of sodium (na+). Schwann cell: wrapped around the axon of the myelinated neurones; not neurones, they have something called myelin in their plasma membrane (myelinated neurones has. Schwann cells wrapped around it: between adjacent schwann cells there are bits of axon exposes, and those are called node of. Ranvier: the resting potential of a myelinated neurone is only found in the nodes of ranvier; not where the schwann cells are found.
