Answer:
Explanation:
avid experienced his first bout at around 12 years old. At first, it was uncontrollable crying, not wanting to get out of bed and go to school, and feelings of worthlessness. He was more sensitive than ever about being “left out.” But even with these feelings, he remained the consummate perfectionist. For example, anything less than an “A” in school would prove to David that he was a worthless person. Now at 18, David’s grades are dropping quickly. He can’t eat; he can’t sleep. The pain he suffers day
True- an involuntary reflex is a reaction that happens when something else occurs. A involuntary reflex is something our body is “programmed” to do automatically.
Answer:
The most correct answer is: It varies in consistency based on the amount of protein fibers and fluid
Explanation:
The extracellular matrix (ECM) is the environment surrounding cells, which is normally composed by fibers (i. e.: collagen, elastin, etc...), soluble proteins and other macromolecules (such as hyaluronic acid) embedded in fluid. The relative concentration and composition of those components conditions, among other things, the physical consistency of the ECM.
- No blood vessel arises from ECM; they derive from specific precursor cells. Additionally, cartilage is an avascular (has no blood vessel) type of connective tissue.
- ECM does provide oxygen and nutrients to diverse tissue, including bone, however bone tissue <em>does</em> have blood vessels.
- Neuronogenesis (generation of new neurons) takes place within the developing nervous system, with neuronal precursor cells being thoroughly surrounded by other cells such as radial glia. Typically, neighboring ECM has a minor or negligible role in this process.
