Diffuse across the plasma membrane and interact with our expression of DNA
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How does protein hormones, enter the cell?
cannot diffuse through, bind with a complementary receptor- triggering a reaction- i.e;glycoprotein. A secondary messenger is required.
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List an example of a secondary messenger in protein hormones.
G-protein: activates=activates an enzyme= adenyl cycles:changes ATP to CAMP. Triggers a cascade of enzyme controlled reactions.
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What is the difference between endocrine and exocrine glands?
Exocrine glands secrete substances (often enzymes) into a duct, which leads to a point of action Endocrine glands secrete hormones directly into the blood.
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What is the relationship between the first messenger and the receptor that it binds with?
They have complementary shapes. The receptor is found on the plasma membrane of the target cells for that hormone.
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Explain why target cells and tissues must have specific receptors on their cell They have complementary shapes. The receptor is found on the plasma membrane of the target cells for that hormone. surface membranes
So that the correct hormone can bind, and no other molecule will be able to bind and have the same effect.
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Explain the difference between first messengers and second messengers.
First messengers are hormones (cell signalling molecules) that carry a signal around the body in the blood. Second messengers are molecules inside the cells that activate an enzyme cascade.
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Why are steroid hormones able to enter the cell?
hey are synthesised from lipid-based molecules, such as cholesterol and are soluble in fats. This means they can dissolve in the phospholipid bilayer.
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Other cards in this set
Card 2
Front
What is the Exocrine system?
Back
Secretion of substances, i.e; sweat, saliva, tears, enzyme. Glands with ducts
Card 3
Front
What are the 2 types of hormone?
Back
Card 4
Front
Which type of hormone is not soluble in the phospholipid membrane?
Back
Card 5
Front
Testosterone is an example of what type of hormone?
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