The correct answer is "phagocytes".
Phagocytes are cells responsible for fighting infection by engulfing and ingesting bacteria and harmful foreign particles. Once phagocytes come in contact with any foreign and dangerous particle, they bind to them and engulf them. This mechanism of action is called phagocytosis.
Answer:
The answer is below
Explanation:
There are differences between ephyra of Aurelia and Medusa of Obelia some of which are:
1. While aurelia developed from the metamorphism of ephyra, the medusa is developed by the budding of blastostyles
2. Similarly, despite the resemblance in body structure, the aurelia is considered jellyfish, while obelia is considered Jellyfish.
3. Also, the medusa period in aurelia is dominant, while that of Obelio is reduced
Explanation:
Fainting is known as lipotimias, syncopes or presyncopes, when knowledge is not lost. They occur when not enough blood reaches the brain in a situation of transient hypotension, in which the regulatory mechanisms that redistribute blood to the brain to maintain oxygen fail. "It is the lack of cerebral percussion that causes the loss of consciousness producing hypotension that lasts a few seconds or minutes," as the expert points out.
Syncopes are generally benign, except for those with a cardiac cause, which are more violent syncopes of sudden death, in which the patient does not have time to react and loses consciousness completely.
The rest are the vasovagal or neuromediated syncopes, which represent a problem when the patient suffers them very frequently or if he falls and is hurting himself. The symptoms that are usually experienced when suffering from syncope can be: feeling of emptiness in the stomach and heat in the head, dizziness or instability and cold sweating.
Answer:
For calculating the surface to volume ratio for a spherical cell,
Surface area (S) = 4πr²
Volume (V) = 4πr³ / 3
Ratio = S / V = 4πr² / 4πr³ / 3 = 3 × 4πr² / 4πr³
= 3/r
1. 15 micrometer diameter = Ratio = 3/7.5 = 0.4
2. 2 micrometer diameter = Ratio = 3/1 = 3
The cells exhibiting high surface to volume ratio shows enhanced metabolic activity. Shows easy uptake of oxygen, nutrients, water, and also the excretion of waste as they possess large surface.
<span>Zookeepers
have a difficulty of keeping koala bears alive because Koala bears are
susceptible to viral infections. There is a virus that is present to Koalas
which is called the Koala retrovirus. Koala retrovirus makes a Koala bear more
susceptible to infections and even cancer. </span>
