Hormones | Back to Top. The endocrine system is a collection of glands that secrete chemical messages we call hormones. These signals are passed through the blood to arrive at a target organ, which has cells possessing the appropriate receptor. Exocrine glands (not part of the endocrine system) secrete products that are passed outside the body. Sweat glands, salivary glands, and digestive glands are examples of exocrine glands. The roles of hormones in selecting target cells and delivering the hormonal message.
Passport validity and the least six month rule. The requirement that a passport is valid for travel for six months beyond the holderâs stay in the United States is waived for certain nationalities, including British Citizens. Please visit 9 FAM 403.9 for more information .
But that's what happens when you get a passport, which is effectively useless for the last six months of its life, with so many countries refusing you entry. Many require at least six months' validity, some require at least three months, yet some are happy to let you in so long as you get home before it runs out. A friend of mine who had to travel overseas for a family emergency had a terrible time trying to book a flight, with less than six months left on her passport.