Delta is a type of fibre that transmits signals that are interpreted and perceived as pain.
<h3>
Delta fibres</h3>
A delta fibres (also known as A fibres) are a type of sensory fibre. They respond to cold and pressure stimuli, and as nociceptors, their stimulation is perceived as fast/first pain input. Because they are thinly myelinated, they transmit impulses quicker than unmyelinated C fibres but slower than other, thicker myelinated "A" class fibres.
Structure
They have myelinated axons that are thin (2 to 5 m in diameter) and have a moderate conduction velocity, or speed at which a nerve signal moves (2 to 30 m/s). These nerve fibres make up the afferent portion of the reflex arc that causes the body to "draw away" from noxious stimuli because they are linked to acute (sharp) pain (e.g. retracting your hand away from a hot stove). A part of A fibres is also linked to pressure and temperature perception (also known as "cold receptors" in mammals). Contrarily, slow-conducting, unmyelinated C fibres convey gradual, scorching pain.
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The patient from the 1950s had a more active life, with a more natural diet.
The patient from the 2000s became more sedentary due to new technologies and started to eat worse with super-processed foods, with that the patient's health got worse.
<h3>What were the main health problems in the past?</h3>
Sanitary hygiene should occur due to the recurring endemics of yellow
- fever
- bubonic plague
- malaria
- and smallpox
diseases associated with the lack of basic sanitation and hygiene. The sewers, at the time, ran in the open and the garbage was deposited in ditches.
With this information, we can conclude that The patient from the 1950s had a more active life, with a more natural diet. The patient from the 2000s became more sedentary due to new technologies and started to eat worse with super-processed foods, with that the patient's health got worse.
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I believe the answer is either B. or C.
Hope this helps!
Evaluating your skills is a key component to a successful physical activity action plan. Assessing yourself through physical tests (e.g. weight and girth measurements) could give you an idea what exactly you want to happen in your training program. Aside from knowing your structure, you should also assess yourself if you are fit enough or you have certain medical conditions that would prohibit you from performing certain activities (e.g. high blood pressure, hypertension).
In doing so, you not only ensure the success of your training action plan, but you also secured your safety before executing the activities you assigned for yourself.
Answer:
Bad sanitation makes one susceptible to diseases, and hunger and lack of clean water makes one even more vulnerable to diseases.
Explanation:
