How do the skeletal and circulatory system work together?

Our body is made up of eleven systems that work together to help our bodies function in harmony. These systems, often called organ systems, are made up of various organs within our bodies.
The purpose of the skeletal system is to help our bodies maintain balance, protection, and support. It provides the framework that allows our bodies to maintain structure and, by working with the muscular system, allows us to move. Our skeleton also protects various organs. For example, the bones of the skull protect the brain, the bones of the ribs protect our lungs, and so on.
Another system in our body is the circulatory system. This system is made up of the heart, blood vessels, and blood. Its purpose is to make sure that oxygen and nutrients reach every component of the body. Other substances that help with immunity, hormones, and so forth are also delivered by the circulatory system.
Now, even though the skeletal and circulatory system have seemingly different purposes, they do work together. One of the main jobs of the circulatory system is to transport red and white blood cells (RBC and WBC) throughout the body. These cells are produced in part from bone marrow, which is found inside the bones that make up the skeletal system. The skeletal system also protects one of the most important organs in our bodies: the heart, which happens to be one of the major components of the circulatory system.
Both systems depend on each other, and the same can be said of all the systems in our bodies—each plays an important role on its own and works with the other systems to maintain function.

A human's skeletal and circulatory systems work in conjunction to provide complete physical protection and chemical support for the body's organs and muscles. Bones also house the marrow that produces blood cells. The red and white blood cells, which carry oxygen and offer immune protection respectively, are then transported throughout the body to organs and muscles via the veins, arteries, vessels and capillaries of the circulatory system.
The skeleton also protects the most vital components of the circulatory system--the heart, pulmonary/coronary/carotid arteries and other structures found in a person's torso--via the placement of the sternum, rib cage and vertebral column. Together, the circulatory and skeletal systems generate a consistent environment for the entire body, both structurally and via the delivery of energy and nutrients, known as homeostasis.
The circulatory system also transports the steroid hormone calcitriol throughout the body which helps regulate levels of calcium and phosphorus as well as control the calcification processes that form bone.