Causes of famine. Famine can be caused by many different reasons, some, like floods, droughts, and earthquakes are natural, and others, like lack of food and shortage in food distribution to specific parts of a region, humans are responsible for.
Transportation: The cardiovascular system transports blood to almost all of the bodyâs tissues. The blood delivers essential nutrients and oxygen and removes wastes and carbon dioxide to be processed or removed from the body. Hormones are transported throughout the body via the bloodâs liquid plasma.
In addition to carrying fresh oxygen from the lungs and nutrients to your body's tissues, it also takes the body's waste products, including carbon dioxide, away from the tissues. This is necessary to sustain life and promote the health of all the body's tissues. There are three main types of blood vessels: 1  Arteries. 2  Arteries carry oxygen-rich blood away from the heart to all of the body's tissues. 3  They branch several times, becoming smaller and smaller as they carry blood farther from the heart and into organs. 4  Capillaries.