What to Pack for the San Francisco Weather in July. While most people come packed for warm, sunny days, I recommend coming with a few long sleeved items so you have something to keep you warm as the evenings cool down. For the San Francisco weather in July, I typically wear short sleeved shirts and pants during the day. You could probably bring along some shorts too. Since it's breezy here in July, you will find it a bit too cool most of the time for shorts.
Bone marrow is the soft, flexible connective tissue within bone cavities. A component of the lymphatic system, bone marrow functions primarily to produce blood cells and to store fat. Red marrow contains hematopoietic stem cells that produce two other types of stem cells: myeloid stem cells and lymphoid stem cells. 2  These cells develop into red blood cells, white blood cells, or platelets.
Red blood cells, white blood cells and plasma are all formed inside of bones in the red bone marrow. Stem cells within the bone marrow constantly produce blood cells and work harder when the body is ill or bleeding to make up for blood cells lost.lowly, as the body ages, this marrow is replaced by inactive marrow that is known as yellow bone marrow. Red bone marrow is responsible for producing and destroying blood cells. About a third of the marrow's production consists of red blood cells and the rest is white blood cells and platelets.