11. One similarity between cell receptors and antibodies is that both? 1. Are specific in their actions because of shape
2. Are produced by nerve cells
3. Are involved in digestion
4. Slow the rates of chemical reactions

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Explanation:

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.