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 .
How Long is a Passport Valid? How long is a passport valid? An adult passport is valid for 10 years. A child passport is valid for 5 years. Be sure to check your passport validity before your travel date. Please review the expiration date of your US passport regularly so you do not end up in a pinch when it is time for passport renewal. Many travelers do not realize the importance of checking for passport validity, even though it is a quick way to sideline a trip.