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Debora [2.8K]
3 years ago
14

In 2000, Bob Harmon discovered the best-preserved Tyrannosaurus Rex skeleton ever found. The fossilized dinosaur was sticking ou

t of the wall of a canyon in Montana. Many scientists were eager to study the fossils. Dr. Mary Schweitzer got one of the leg bones to analyze. Dr. Schweitzer's assistant dissolved the bones in acid and discovered that some soft tissue had survived even after 68 million years. The discovery was a shock to the scientific community. No one had ever found such old tissues. Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone.
Which organ system do blood cells and blood vessels belong to?


A.circulatory system

B.nervous system

C.skeletal system

D.respiratory system
Biology
1 answer:
irakobra [83]3 years ago
3 0
A, the circulatory system
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The muscles of the eye cover a greater number and in turn carry out greater fine motor skills.

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Alpha motor neurons are neurons that invent the skeletal muscle, that is, striated, so that through the motor plate that is the unit that unites them, an action potential is transmitted that contracts the sarcomeros of the elastic fibers and the z lines. come closer, each eye movement is much more precise than the locomotion of the lower limb, which carries greater innervation in each muscle bundle due to the specificity of the movement, this is how more alpha motor neurons are required to mobilize the eye than a leg.

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Improved bone regeneration through amniotic membrane loaded with buccal fat pad-derived MSCs as an adjuvant in maxillomandibular
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Mesenchymal stem cells and HAM together may improve bone repair, especially in the horizontal dimension. Additionally, this technology lessens secondary bone resorption and the quantity of collected autogenous bone.

HAM:

  • Background: Human amniotic membranes (HAMs), a biological membrane with potential for cell therapy, osteogenesis, and healing, have come under the spotlight as a way to improve the results of treating bone abnormalities. The goal of the current study is to clinically evaluate the possibility of HAM loaded with stem cells from the buccal fat pad (BFSCs) as an osteogenic covering for only bone transplants to maxillomandibular bone lesions.
  • Materials and methods: The current investigation included nine patients with jaw bone abnormalities. Iliac crest bone graft with HAM covering (n = 5) and iliac bone grafts coated with HAM loaded with BFSCs (n = 4) were the two study groups that the patients were divided into. Cone beam computed tomography was carried out for radio morphometric characterization five months after the grafting and before the installation of the implant.
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