IB Biology Option H, Hormone Control

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  • Created by: Chloe
  • Created on: 09-04-13 16:25
Chemical messengers secreted by the pituitary gland into the blood
What are hormones?
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steroid hormone (FSH), protein/peptide hormone (oestrogen), tyrosine derivative (thyroxine)
Types of hormones and examples
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dont pass through the plasma membrane use vesicles to enter
Steroid hormones action
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Sends a message down the axon to a nerve to stimulate a response
Peptide hormone action
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Relationship between the hypothalamus and the anterior pituitary lobe
Hormones are sent from the hypothalamus to the anterior pituitary via a blood vessel called the portal vein. The hypothalamus acts as the endocrine gland and produces releasing hormones.
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Relationship between the hypothalamus and the anterior pituitary lobe
Hormone travels in blood through portal vein to the cells of the anterior pituitary Releasing hormone causes secretion of specific hormones
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Relationship between the hypothalamus and the posterior pituitary lobe
Neurosecretory cells connect the hypothalamus and the posterior pituitary lobe Hormones secreted from the posterior lobe are produced in the hypothalamus. Nerve impulses travel down the axon into the posterior pituitary.
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Relationship between the hypothalamus and the posterior pituitary lobe
Nerve impulses travel down the axon into the posterior pituitary. This causes the release of the vesicles of hormones into the blood stream at the posterior pituitary
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Control of ADH secretion by negative feedback
The homeostatic regulation of water (osmoregulation) is controlled by secretion of anti-diuretic hormone (ADH). Osmoreceptor cells monitor the water content of the blood as it passes through the hypothalamus
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Control of ADH secretion by negative feedback
Neurosecretory cells in the hypothalamus synthesize ADH and transport this along the axon of their nerves for storage in their synaptic end.
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Control of ADH secretion by negative feedback
Osmoreceptor cells send action potential through the neurosecretory cells to the posterior pituitary if water content in low, secreting ADH and reabsorbing water into the bloodstream
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Control of ADH secretion by negative feedback
ADH is secreted and targets the collecting duct, making it more permeable to water, f the water content is high, no signal is sent for ADH secretion.
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Other cards in this set

Card 2

Front

Types of hormones and examples

Back

steroid hormone (FSH), protein/peptide hormone (oestrogen), tyrosine derivative (thyroxine)

Card 3

Front

Steroid hormones action

Back

Preview of the back of card 3

Card 4

Front

Peptide hormone action

Back

Preview of the back of card 4

Card 5

Front

Hormones are sent from the hypothalamus to the anterior pituitary via a blood vessel called the portal vein. The hypothalamus acts as the endocrine gland and produces releasing hormones.

Back

Preview of the back of card 5
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