CH17 Pics Flashcards
Name the struture labelled A
Hyoid Bone
Name the struture labelled B
Thyroid cartilage
Name the struture labelled C
Inferior thyroid artery
Name the struture labelled D
Epiglottis
Name the struture labelled F
Isthmus of thyroid gland
Name the struture labelled E
Superior thyroid artery
Name the struture labelled G
Left lateral lobe of thryroid gland
Which cells are shown marked A?
Thyoid follicular cells
what is happening at the point marked 1?
Thyroglobulin is synthesized and discharged into the follicle lumen
what is happening at the point marked 2?
Iodide (I-) is trapped or actively transported in
what is happening at the point marked 3?
Iodide is oxidized to iodine
what is happening at the point marked 4?
Iodine is attached to tyrosine in colloid, forming DIT and MIT
what is happening at the point marked 5?
Iodinated tyrosines are linked together to form T3 and T4
what is happening at the point marked 6?
Thyroglobulin colloid is endocytosed and combihned with a lysosome
what is happening at the point marked 7?
Lysosomal enzymes cleave T3 and T4 from thyroglobulin and hormones diffuse into bloodstream
what is the structure marked A?
Posterior lobe of pituitary
What is happening at the point marked 1?
Hypothalamic neurons synthesize oxytocin or ADH
What is happening at the point marked 2?
Oxytocin or ADH are transported down the axons of the hypothalamic hypophyseal tract to the posterior pituitary
What is happening at the point marked 3?
Oxytocin and ADH are stored in axon terminals of the posterior pituitary
What is happening at the point marked 4?
When hypothalamic neurons fire, action potentials arriving at the axon terminals release oxytocin and ADH into the blood
what is happening at the point marked A?
PTH release from parathyroid gland
what is happening at the point marked B?
Osteoclast activity in bone causes CA2+ and PO43 release into blood
what is happening at the point marked C?
CA2+ reabsorption in the kidney tubule
what is happening at the point marked D?
Activation of vitamin D by kidney
what is happening at the point marked E?
CA2+ absorption from food in the small intestine
What type of actions are promoted at the A route?
Indirect actions (growth promoting)
what type of actions are promoted at the B route?
Direct actions (metabolic/anti-insulin)
WHich part of the adrenal gland is indicated at point A?
Medulla
Which part of the adrenal histology is indicated at point C?
Cortex
Which part of the adrenal histology is indicated at point D?
Medulla
Which layer of the adrenal gland is indicated at point E ?
Zona glomerulosa
Which layer of the adrenal gland is indicated at point F?
Zona fasciculata
Which layer of the adrenal gland is indicated at point G?
Zona reticularis
Which layer of the adrenal gland is indicated at point H?
Adrenal medulla
Which hormones are secreted at point I ?
Aldosterone
Which hormones are secreted at point J?
Cortisol and androgens
Which hormones are secreted at point K?
Epinephrine and norepinephrine
