Bone Marrow
Step-by-step explanation:
Red blood cells are created deep inside our bones in the bone marrow
- Bone marrow is the soft, spongy tissue inside the bones that makes blood-forming cells (blood stem cells)
- These cells turn into blood cells including: White blood cells to fight infections,red blood cells to carry oxygen throughout the body,platelets to control bleeding
Hair root is not visible because they are under the skin
- Hair is a keratinous filament growing out of the epidermis which is primarily made of dead, keratinized cells
- Strands of hair originate in an epidermal penetration of the dermis called the hair follicle
- The part of hair which is anchored in the follicle, lies below the surface of the skin and is referred to as the hair root
- The hair root ends deep in the dermis at the hair bulb,and includes a layer of mitotically active basal cells called the hair matrix