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Bio 169 exam 1 Questions and Answers

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  • BIO 169 Blood

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...

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  • August 15, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • BIO 169 Blood
  • BIO 169 Blood
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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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