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it is secreted by the thyroid gland in small amounts and travels through the blood system and reaches the desired cells.

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12y ago

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Steroid hormones enter the bloodstream by diffusion and?

Steroid Hormones only enter the bloodstream by diffusion. If you are a student taking anatomy/phyiso 2 and refering to this question: All steroid hormones are derived from (cholesterol). Which steroid hormone is produced is determined by the (enzymes) present in the cell. The common precursor molecule for all steroid hormones is (pregnenolone). Steroid hormones enter the blood stream by (diffusion) and (do) require a carrier. The rate of secretion of steroid hormones is (slower) then catecholemines because steroid hormones are not (stored). Hope that helps-


How does a hormone identify its target?

Only target cells have receptors inside cytoplazm (for steroid hormones) or on cell membrane (for protein hormones) that make the hormone active.


What does the organs influenced by hormones are called?

They are the target organs. Hormones act on the target organs


What is the difference between protein hormones and steroid hormones and how they communicate with their target cells?

Steroid hormones arelipid-soluble and can dissolve easily into the cell membrane of the target cell to connect with receptors. Protein hormones are water-soluble and connect with receptors at the membrane because it can't diffuse through the membrane.


What hormones can enter the target cell and bind to receptors in the nucleus?

Steroid hormones, such as estrogen and testosterone, are able to enter the target cell and bind to receptors in the nucleus. These hormones are lipid-soluble, allowing them to pass through the cell membrane and directly interact with nuclear receptors to regulate gene transcription.


Hormones affect specific tissues called?

Hormones affect specific tissues called target tissues or target cells. These tissues have receptors that bind to hormones, triggering a response or change in cellular activity.


Are target tissues close to the glands that affect them?

most endocrine hormones are circulating hormones not local hormones.


Are hormones target molecules or signal molecules?

Hormones affect target cells because target cells have receptors that bind with certain hormones (they're specific). If a cell does not have a receptor then it is not affected by hormones. Target cells (which do have the receptor for a particular hormone) would be affected by the hormone.


Steroid hormones cannot pass through the plasma membranes of their target cells?

False. Steroid hormones are lipophilic molecules that can pass through the plasma membrane of target cells. Once inside the cell, they bind to specific receptors located in the cytoplasm or nucleus, leading to changes in gene expression and cellular responses.


What is the difference between receptors for steroid hormones and Peptide hormone?

Peptide based hormones exert their effects on a cell by way of second messengers (cAMP or PIP) pathways. Steroid based hormones exert their effects on a target cell via direct gene activation.


Where would steroid hormones most likely interact with their target cell?

Steroid hormones typically interact with their target cells inside the cell, specifically in the cytoplasm or nucleus. Once inside, they bind to specific receptor proteins, forming hormone-receptor complexes that can then modulate gene expression and alter cellular processes.


What does steroid and thyroid hormones do upon entering the blood?

Steroid hormones bind to specific receptors within the target cells to regulate gene expression and control various physiological functions. Thyroid hormones regulate metabolism by influencing the activity of enzymes and affecting the consumption of oxygen by cells.