AP BIOLOGY

Detailed explanation-1: -The heart is an organ about the size of your fist that pumps blood through your body. It is made up of multiple layers of tissue. Your heart is at the center of your circulatory system.

Detailed explanation-2: -Your heart is actually a muscular organ. An organ is a group of tissues that work together to perform a specific function. In the case of your heart, this function is pumping blood throughout your body. Additionally, the heart is largely made up of a type of muscle tissue called cardiac muscle.

Detailed explanation-3: -The heart is a hollow muscular organ about the size of a closed fist. It’s in the centre of your chest, behind the breastbone. Each heartbeat sends blood that’s rich in oxygen and nutrients to all parts of your body.

Detailed explanation-4: -Some say the heart is the most selfish organ in the body because it keeps all the good blood for itself. It takes in all the good blood, the most oxygenated blood, and then distributes the rest to every other organ. So, in a sense maybe the heart is selfish.

Detailed explanation-5: -The cells also produce waste that they need to get rid of. Thus, the first organ system to develop is the heart, blood and circulatory system, so that nutrients and waste can be transported throughout the growing embryo. The heart continues carrying out this same vital job throughout our lives.