Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Questions and
Answers
Bio 169 exam 1 Ques...
Bio 169 exam 1 Questions and
Answers
endocrine system
✓ ~~~Composed of ductless glands that synthesize and secrete hormones
✓ Hormones are released into the blood and transported throughout the body
target cells
✓ ~~~cells that have receptors for a particular hormone
endocrine glands
✓ ~~~Glands of the endocrine system that release hormones into the bloodstream
comparison of both systems
✓ ~~~Both the endocrine and nervous system
Release ligands—chemical messengers
Difference between the two systems
✓ ~~~Unlike the nervous system, the endocrine system
Transmits hormones through the blood
Targets any cells in the body with correct receptors
Can be very widespread
Exhibits longer reaction times
Has longer-lasting effects (minutes to days and weeks)
, hormonal stimulation
✓ ~~~A gland cell releases its hormone when some other hormone binds to it
Humoral stimulation
✓ ~~~A gland cell releases its hormone when there is a certain change in levels of a nutrient
or ion in the blood
Nervous stimulation
✓ ~~~A gland cell releases its hormone when a neuron stimulates it
Steroids
✓ ~~~Lipid-soluble molecules synthesized from cholesterol
Biogenic amines
✓ ~~~Modified amino acids, Water-soluble except for thyroid hormone (TH)
TH is nonpolar (made from a pair of tyrosines) and lipid soluble
Proteins
✓ ~~~Most hormones are in this category
Water-soluble chains of amino acids
Lipid-Soluble Hormones
✓ ~~~Lipid-soluble hormones can diffuse across target cell membrane, The complex binds
to a hormone-response element of DNA
Results in transcription of an mRNA, which is translated to a protein
The protein may have structural or metabolic effects
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