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True or false steroid hormones perform accoding to the second messenger mechanism?
steroid hormones are hydrophobic and bind to transport proteins which bind to receptors within the nucleus. hydrophillic hormones bind to plasma membrane receptors and act through second messenger systems
Why is a second messenger not necessary in a steroid hormone?
Steroid hormones act in the transcriptional level in the nucleus of a cell, due to their ability to travel through cell membranes (hydrophillic). Second messengers are necessary for hormones that cannot penetrate cell membranes (peptides).
What molecule stores energy and forms cell membrane and acts as hormones and insulates?
The molecule that fits this description is lipid. Lipids store energy, form cell membranes as phospholipids, act as hormones like steroid hormones, and provide insulation through substances like adipose tissue.
What hormones can cross the cell membrane?
steroid hormonesSteroidalHormones are steroids and go across the membrane through specific receptors - this is why a hormone will act on certain tissue only e.g. estrogen only on mammary glands, uterus etc.
What is the difference between direct and tropic hormones in terms of their mode of action on target organs?
Direct hormones act directly on target organs by binding to specific receptors on the cell surface, triggering a response within the cell. Tropic hormones, on the other hand, act indirectly by stimulating the release of other hormones from endocrine glands, which then affect the target organs.
Explain the mechanism of action of nonsteroid hormones?
All non steroid hormones are proteinacious and can't enter cell .they attach with fixed membrane receptor which activates an enzymes that activates a second messenger i.e. cAMP that carries message in side cell .
How can a hormone that is present in very small quantities within the bloodstream elicit such a large response within a cell?
Hormones act as chemical messengers, binding to receptors on cell surfaces to trigger specific signaling pathways within the cell. Even at low concentrations, hormones can activate cascades of cellular responses due to amplification mechanisms in the signaling pathways, leading to significant effects on cellular processes.
What local hormones produced by most body tissues are called?
Local hormones produced by most body tissues are called autocrine and paracrine hormones. Autocrine hormones act on the same cell that produced them, while paracrine hormones act on nearby cells within the same tissue.
What signal that act within the animal body are produced by glands?
hormones
How do hormones act upon?
Hormones are chemicals in the body that do all sorts of things for you. They regulate growth, reproductive systems, metabolism and more! When people think of hormones, they think of sexual hormones...but there are LOTS of different types of hormones that are constantly moving around your body! That dose not answer the question^
Do extrinsic proteins act as cell receptors?
yes, for things like hormones. they are only situated on the outside of the plasma membrane- unlike intrinsic proteins which act as channel, or hydrophillic pores which allow charged molecules to enter the cell.
How are prostaglandins different from hormones?
Hormones and prostaglandins are similar because they deliver messages throughout the body.Prostaglandins act the same way hormones do, but only act in the specific area intended. They are synthesized from fatty acids.
