Diversity within species 

450-700 (mycoplasma)

4000 in bacteria (eg. Escherichia coli)

13,000 in Fruit-fly (Drosophila melanogaster)

32,000 – 50,000 in rice (Oryza sativa)

35,000 to 45,000 in human beings (Homo sapiens sapiens). 

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#Unit 7. System Physiology – Animal

There are neural connections between the hypothalamus & posterior pituitary & vascular connections between the hypothalamus & anterior pituitary

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#Id: 5685

#Unit 7. System Physiology – Animal

The posterior lobe hormones are nanopeptides with a disulfide ring at one end

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#Unit 7. System Physiology – Animal

The hormones secreted by the posterior pituitary gland (neurohypophysis) are arginine vasopressin (AVP) and oxytocin

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#Unit 7. System Physiology – Animal

Arginine in the vasopressin molecule is replaced by lysine to form lysine vasopressin 

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#Id: 5688

#Unit 7. System Physiology – Animal

Oxytocin and vasopressin are typical neural hormones, that is, hormones secreted into the circulation by nerve cells

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#Id: 5689

#Unit 7. System Physiology – Animal