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 .
However, the passport must still be valid for the length of the proposed trip. Thus, if planning a two month stay, the passport presented at the airport must be valid for at least that two month period, but does not have to be still valid for six months.If you are traveling visa free and your passport is valid for less than 90 days, you will be admitted only until the date the passport expires.owever, the passport must still be valid for the length of the proposed trip. Thus, if planning a two month stay, the passport presented at the airport must be valid for at least that two month period, but does not have to be still valid for six months.