17 Questions
What is the function of hormones produced by endocrine glands?
Activate muscle contraction and relaxation
Which type of glands do not have ducts for secretion?
Endocrine glands
How do hormones from endocrine glands reach their target organs?
By diffusion into the blood
Which type of gland secretes substances directly to a specific compartment or surface?
Exocrine glands
What is the main role of the nervous system in relation to exocrine glands?
Controlling glandular secretions
How do endocrine glands differ from exocrine glands?
Endocrine glands secrete directly into blood while exocrine secrete to a surface.
Which term describes glands that serve both endocrine and exocrine functions?
Mixed glands
What is the significance of a hormone's half-life?
Indicates the duration of the hormone's effect in the body
What characterizes steroid-derived hormones in terms of solubility?
Insoluble in blood plasma
How do amine and peptide hormones differ from steroid hormones?
They are synthesized from amino acids
In what way do prostaglandins differ from other hormones mentioned?
They are not found in the plasma membrane
How do hormones predominantly circulate in the blood to affect target cells?
Through a second messenger system
What is the primary factor determining a target cell's response to a hormone?
Number of receptors for the hormone on the target cell
How do fat-soluble steroid hormones primarily enter target cells?
By diffusion through the plasma membrane
In what way can a hormone increase enzyme activity by altering the enzyme's shape and function?
By allosteric modulation of the enzyme
Which factor plays a crucial role in determining the extent of activation of a target cell by a hormone?
The strength of the union between hormone and receptor
Where do hormone receptors mainly exist in target cells?
On the plasma membrane
Test your knowledge on how the endocrine system integrates and regulates bodily functions. Learn about the glands, hormones, and their effects on various aspects of human function.
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