Answer:
When patient takes in antibiotics the resistance bacteria gets a competitive survival advantage over the normal sensitive bacteria and hence grows faster.
Explanation:
- Bacteria can acquire resistance by taking in plasmids containing MDR (Multi-Drug Resistance) gene cassettes. The MDR genes produces proteins that can:
- Render the antibiotic ineffective to act on its target by inducing chemical modifications on the drug.
- Promote efflux of the drug from the bacterial cell so that the drug cannot act upon its target.
- When a healthy person ( having no prior exposure to the antibiotic) is infected by bacteria ( both sensitive and resistant varieties):
- A competition develops for the host cells and nutrients between the sensitive and the resistant variety.
- This mutual competition restricts either of the sensitive or resistant bacterial strain to grow profusely.
- When a person (having prior antibiotic exposure), gets infected by bacteria ( both sensitive and resistant varieties) and is exposed to the same antibiotic:
- The sensitive variety, due to its sensitivity towards the drug, gets killed.
- The resistant variety, due to its MDR genes, bypasses the lethal effect of the drug and survives.
- These surviving resistant bacteria can now infect all the available host cells and utilise all the available nutrients without facing any competition and multiply rapidly.
Answer: Sympathetic nervous system.
Explanation:
In the adrenergic synapse, the neurotransmitter is norepinephrine. Adrenergic synapses release the neurotransmitter in the Sympathetic nervous system. This system controls reactions related to Increase brain activity and alertness, Dilation of the pupils, Crystalline accommodation for distance vision, Increased Respiratory and Cardiac Frequency, Vasodilation in the muscles of the legs, Reduction of salivary secretion, gastric and intestinal.
Answer:
B- The speed of sound will increase due to the increasing density of seawater.
Explanation:
If the temperature of seawater decreases its density increases, but only to a point
Answer:
Jasmine's body responds with a mechanism of heat loss, such as sweating and evaporation, to reduce her internal body temperature and recover homeostasis.
Explanation:
The human is a homeotherm organism, with a constant body temperature that is between 36.5 and 37 °C. To maintain thermal homeostasis uses several mechanisms.
In the case of Jasmine, the raise of the body temperature, with the exercise, to 38°C stimulates sweat production and its body surface becomes moist. With the evaporation of sweat, body temperature normalizes, since this process involves heat loss.
Also, a voluntary mechanism to lower the temperature is to remove the clothes and remain in a cool environment.
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