The skin is superficial to the muscle
and the muscle is superficial to the skin
Answer:
A brain ventricle is a cavity in the brain with an open channel leading to it.
Explanation:
The brain and spinal cord are encased and protected by three layers of tissue, all called meninges. The outermost layer is called the dura mater, and covers both the brain and spinal cord. On either side of this layer, where it crosses or penetrates into these organs, are two extensions that look like small tubes coming from under a tent. These extensions are called cranial nerves because they come out on either side of the head just below its most prominent part - hence "cranial".
I’m pretty sure that your answer would be A
The alternative pathway of complement useful in the early stages of an infection because <u>It's faster than the other complement pathways</u>.
The alternative pathway is one of three complement pathways that opsonize and kill pathogens. This pathway is activated by viruses, fungi, bacteria, immunoglobulin A and forms an important part of the defense mechanism independent of the immune response.
The alternative pathway (AP) is slowly activated spontaneously by hydrolysis of the internal C3 thioester bond [12–14] and further triggered by contact with various proteins, lipids and carbohydrate structures on microorganisms and other foreign surfaces [1, 15].
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