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 .
Do I need six months validity left on my passport before I can travel from and then re enter Australia? You passport is valid from the date it is issued until the date it expires. You can use it throughout this period, subject to meeting the visa and immigration requirements of the countries you wish to visit or transit. Some foreign governments require visitors to carry passports with at least six months validity beyond their planned stay. You may be refused entry if you do not comply. Well before you travel, you should check the entry requirements of the countries you plan to visit or transit.