Qhov sib txawv tseem ceeb ntawm cov hlwb parafollicular thiab follicular yog hom kev tso tawm txhua hom cell ua. Parafollicular cells secrete calcitonin, whereas follicular cells secrete thyroxin thiab triiodothyronine.
Cov thyroid caj pas yog lub caj pas tseem ceeb ntawm endocrine. Cov thyroid hormones ua ntau yam kev ua haujlwm, los ntawm kev tswj hwm homeostasis hauv lub cev kom tswj cov metabolism. Parafollicular thiab follicular hlwb nyob ib sab ntawm ib leeg hauv cov thyroid caj pas. Kab lus no tham txog qhov txawv ntawm parafollicular thiab follicular cells.
Dab tsi yog Parafollicular Cells?
Parafollicular cells lossis C cells secrete calcitonin los ntawm cov thyroid caj pas. Lawv nyob rau hauv chav kawm ntawm neuroendocrine hlwb. Lawv muaj nyob rau hauv cov ntaub so ntswg ntawm ib sab ntawm lub follicular hlwb nyob rau hauv cov thyroid caj pas. Ntxiv mus, lawv loj thiab daj ntseg nyob rau hauv kev sib piv rau follicular hlwb. Cov kab mob parafollicular tuaj yeem pom txuas mus rau basal membrane. Kev loj hlob ntawm cov hlwb parafollicular tshwm sim los ntawm pharyngeal endoderm los ntawm lub hnab pharyngeal thib plaub.
Daim duab 01: Parafollicular Cells
Lub luag haujlwm tseem ceeb ntawm cov hlwb parafollicular yog tso tawm calcitonin. Calcitonin yog cov tshuaj hormones xav tau rau calcium homeostasis hauv tib neeg. Thaum cov ntshav calcium ntau ntxiv, cov hlwb parafollicular secrete calcitonin kom txo cov ntshav calcium. Tsis tas li ntawd, calcitonin kuj inhibits pob txha resorption. Ntxiv nrog rau qhov tso tawm ntawm calcitonin, lawv kuj tseem zais me me ntawm serotonin, somatostatin thiab CGRP.
Follicular Cells yog dab tsi?
Follicular cells (thyroid epithelial cells lossis thyrocytes) muaj nyob hauv cov thyroid caj pas. Lawv tsim thiab tso cov thyroid hormones. Muaj ob lub ntsiab thyroid hormones li thyroxin thiab triiodothyronine.
Daim duab 02: Follicular Cells
Follicular cells yog cov kab mob yooj yim cuboidal epithelial. Lawv raug teem raws li spherical follicles. Tsis tas li ntawd, lawv embed lawv tus kheej nyob rau hauv qhov chaw uas muaj kua dej hu ua colloids. Ntxiv mus, lawv tsim follicular lumen nyob rau sab hauv. Lub basal membrane ntawm follicular epithelial hlwb muaj receptors rau cov thyroid stimulating hormone.
Kev loj hlob ntawm cov hlwb follicular tshwm sim nyob rau hauv lub endodermal loj nyob rau hauv cheeb tsam ntawm tus nplaig hu ua foramen cecum. Lub luag haujlwm tseem ceeb ntawm cov hlwb follicular yog tso tawm cov thyroid hormones. Tsis tas li ntawd, lawv noj iodide thiab amino acids hauv kev ncig thiab ua rau tso tawm cov thyroid hormones nrog kev pab ntawm proteases.
Dab tsi zoo sib xws ntawm Parafollicular thiab Follicular Cells?
- Ob hom hlwb muaj nyob rau hauv cov thyroid caj pas.
- Ntxiv mus, so ntawm lub basal membrane.
- Lawv tso cov tshuaj uas tseem ceeb rau kev ua haujlwm ntawm peb lub cev.
Qhov txawv ntawm Parafollicular thiab Follicular Cells yog dab tsi?
Parafollicular cells thiab follicular cells muaj nyob hauv cov thyroid caj pas. Txawm li cas los xij, muaj qhov sib txawv ntawm cov hlwb parafollicular thiab follicular raws li lawv txoj haujlwm, qauv thiab kev loj hlob. Lub luag haujlwm tseem ceeb ntawm cov hlwb parafollicular yog tso tawm calcitonin; Yog li, nws tswj cov calcium homeostasis. Hauv qhov sib piv, lub luag haujlwm tseem ceeb ntawm cov hlwb follicular yog zais thyroxin thiab triiodothyronine. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm parafollicular thiab follicular hlwb. Ntxiv mus, lawv txawv ntawm qhov loj me thiab. Parafollicular cells loj dua nyob rau hauv qhov sib piv rau cov hlwb follicular.
Cov hauv qab no nthuav tawm cov ntaub ntawv ntxiv txog qhov sib txawv ntawm cov kab mob parafollicular thiab follicular.
Summary – Parafollicular vs Follicular Cells
Nyob rau hauv luv luv, parafollicular thiab follicular hlwb muaj nyob rau hauv cov thyroid caj pas secrete ntau yam endocrine hormones. Txawm li cas los xij, muaj qhov sib txawv ntawm cov hlwb parafollicular thiab follicular raws li lawv txoj haujlwm, qauv thiab kev loj hlob. Parafollicular cells secrete calcitonin thaum lub hlwb follicular secrete thyroxin thiab triiodothyronine. Lawv tam sim no ib leeg ib leeg, tab sis lawv txawv ntawm lawv txoj kev loj hlob. Cov cell loj kuj txawv raws li cov cell parafollicular loj dua cov hlwb follicular. Tsis tas li ntawd, cov hlwb parafollicular muaj cov duab sib txawv, tsis zoo li cov hlwb follicular. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm parafollicular thiab follicular cells.
