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SCORPION-xisa [38]
3 years ago
6

True or False

Biology
1 answer:
NikAS [45]3 years ago
8 0

Answer:

A.true

B.false

Explanation:

A. lymphocytes or bcells produce antibodies involved in humoral immunity

B. innate immune system is sustained long by innate immune cells

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All living things are made up of carbon. This is because
klemol [59]

Answer:

c

Explanation:

7 0
3 years ago
HELP NEEDED PLEASE!!
emmasim [6.3K]

Answer:

B

Explanation:

Nerve cells can carry signals and connect all parts of the body to the brain

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Why are the fields of science, technology, engineering, and math important in the modern world?
Katyanochek1 [597]

Explanation:

  1. This is 21st century .In this time our society as well as all of the world had become advanced and modern.So,in this time if we started to work without any technology then while working we need more manpower and our time will be loss.Science ,technology,engineering and maths play important role in modern world d .It helps in sustain able development and helps any country to be self dependent and makes profit by which Nations will be developed and it helps to win the future.
  2. Hope is useful for you.have a nice day.
4 0
2 years ago
Once a neuron is stimulated and the membrane potential is depolarized, the depolarized axonal membrane is helped to return to it
Vadim26 [7]

Answer:

Explanation:

The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.

The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.  

When the neurons get excited, the sodium ions start to enter by sodium channels.  

Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.

When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.

But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2  potassium ions pumped into the cell through the plasma membrane.  

Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.

4 0
3 years ago
Read 2 more answers
Body mass index is used as a measure of obesity for all of the following reasons except
Arlecino [84]

options:

a) noninvasive

b) precise

c) inexpensive

d) easy

Answer:b) precise

Explanation: BMI(BODY MASS INDEX) is a very vital measurement tool for evaluating and the determining the level of Obesity of overweight of a person.

Body mass index is noninvasive, it is inexpensive and easy way of knowing how well the body weight and height is related to a person's well being.

It is calculated as follows; WEIGHT(KILOGRAMS)/SQUARE OF THE HEIGHT(METERS)

3 0
3 years ago
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