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TLS Online TPP Program

#Id: 1268

The synthesis and secretion of steroid hormones by the adrenal cortex depend on the stimulation of cholesterol desmolase by ACTH.

#Unit 7. System Physiology – Animal #Adrenocortical Hormones #Part B Pointers
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TLS Online TPP Program

#Id: 1021

#Unit 5. Developmental Biology

The vertebrate ectoderm, has 3 major responsibilities:
1. One part will become the neural plate
2. One part will become the epidermis
3. One part will become the neural crest
TLS Online TPP Program

#Id: 1022

#Unit 5. Developmental Biology

High levels of BMP specify the cells to become epidermis.
TLS Online TPP Program

#Id: 1023

#Unit 5. Developmental Biology

Very low levels of BMP specify the cells to become neural plate.
TLS Online TPP Program

#Id: 1024

#Unit 5. Developmental Biology

Intermediate levels of BMP effect the formation of the neural crest cells.
TLS Online TPP Program

#Id: 1025

#Unit 5. Developmental Biology

In mammals, Noggin (antagonist of BMP) is expressed in the notochord and neural folds.
TLS Online TPP Program

#Id: 1026

#Unit 5. Developmental Biology

Neural plate formation follow the principle of development:  often the signals promoting the specification of one cell type also block the specification of an alternative cell type.