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MissTica
3 years ago
11

Red blood cells are created deep inside our bones in the _________________ . 4. Your __________________ are not visible because

they are under your skin - b
Biology
1 answer:
marshall27 [118]3 years ago
3 0
<h2>Bone Marrow</h2>

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
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