A simple or closed fracture does not break the skin. This is further explained below.
<h3>What is a closed fracture?</h3>
Generally, a closed fracture is simply defined as a situation whereby the skin hasn't been damaged, even if the bone is cracked.
In conclusion, If the fracture is simple or closed, no blood will be seen on the skin. More detail about this is provided below.
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Answer:
They contain protein fibres that can contract when energy is available, making the cells shorter.
First, we can eliminate 2 options. The simple unit of protein is amino acid, instead, the simple unit of fat and lipids are fatty acids and glycerol, therfore we can eliminate option A and D because fatty acids does not exist in protein.
Now we are left with B and C. To solve that, we need to understand that protein is made of a chain of amino acids, a lot of amino acids are chemically combined and cannot be broken down unless the use of enzymes. Amino acid are actually the monomers that forms protein.
Therefore, the answer is C. amino acid combine to form a protein chain.
Mitosis and cell differentiation leads to the creation of red blood cells in the body from bone marrow stem cells by a process called Erythropoiesis.
<u>Explanation</u>:
The process of development of red blood cells from bone marrow stem cells is called as erythropoiesis. The process is enthused by lower amount of oxygen during circulation, which is sensed by the kidney, after which it starts secreting a hormone called erythropoietin. In production of RBCs, the erythropoietin provokes the development and differentiation. All this phenomenon happen inside the Bone marrow. Throughout the creation of RBCs, there undergoes a sequence of mitosis and differentiation.
Answer:
D. Friction
Explanation:
friction is when two materials rub against eachother
