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Andrej [43]
3 years ago
10

Which of the following molecules is/are most likely to have selective proteins in the BBB to facilitate its passage into the bra

in? a. Antibodiesb. Starchc. Amino acidsd. Urea
Biology
2 answers:
ANEK [815]3 years ago
8 0

Answer:

The correct answer is option - C amino acids.

Explanation:

The blood brain barrier or BBB is border that separates extracellular fluid in the central nervous system (CNS) and the blood that is circulating from the brain.

This barrier is allows the passage by facilitate diffusion (passive diffusion) and through the selective proteins of molecules such as glucose, amino acids that are essential for the neural function.

Thus, the correct answer is -  amino acids.

icang [17]3 years ago
3 0

Answer:

c. Amino acids          

Explanation:

             BBB stands for the blood brain barrier. The proper functioning of the brain is meant by the amino acids. Amino acids are most necessary for  production of proteins which are essential for the working of any cell.

           In general antibodies and large polysaccharides like starch are too large and are not able to cross the blood-brain barrier. Whereas urea does not have specialized proteins and therefore they cannot enter the brain.

Hence the correct option is (c).

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Predict the consequences if presynaptic action potentials in an axon release insufficient acetylcholine to depolarize a skeletal
Komok [63]

Answer:

The impulse will not be transmitted

Explanation:

The nervous system sending a signal by triggering the action potential of the cell. To trigger the action potential, a certain threshold of membrane potential has to be reached. Acethylcholine is a neurotransmitter that can change the membrane potential, and if the number if enough will trigger an action potential.

If the number of acetylcholine is not enough, there will be no action potential triggered and the signal will not be transmitted. Since the signal won't reach the muscle,  then muscle contraction will not happen.  

7 0
3 years ago
A population of mussels was observed in a particular ecosystem. crabs have recently been observed occupying this ecosystem, whic
STALIN [3.7K]

The correct statements are 1, 2, and 5 as they explain the adaptations that mussels developed to prevent their extinction and how this aided them in natural selection.

Crabs are omnivores. The smaller crabs can eat seaweed, worms, shrimp, algae, etc while the larger ones can eat mussels, snails, and squid. Crabs can change their feeding grounds because of environmental changes. Mussels being the prey of crabs were forced the development of new traits to ensure their survival. They started to produce thicker shells. This allowed the mussels with thicker shells to survive as they would not get eaten by the crabs, thus undergoing natural selection. The development of said trait improved the survival rate of mussels and prevented them from going extinct due to predation.

Note: The question seems to be incomplete and the options could have been

  1. "A change in the environment led to a new distribution of traits in a population.
  2. The trait of shell thickening underwent natural selection.
  3. The trait for shell thickening will not be selected by future mussel generations.
  4. Half of the mussel population developed the trait while the other half did not.
  5. Mussels with the shell thickening trait had a greater chance of survival."

Learn more about adaptations and natural selection here:

brainly.com/question/15499665

#SPJ4

6 0
1 year ago
The partial pressure of oxygen in arterial blood is approximately:.
rusak2 [61]

Answer:

between 75 mmHg and 100 mmHg

Explanation:

7 0
2 years ago
What are some negative impacts of having this life cycle that might have contributed to a decline in the dragonfly population?
KonstantinChe [14]

Answer:

Dragonflies are important for our environment.

Explanation:

Dragon flies belongs to the ancient family of insects. They are found on every parts of the world and have been from around 300 millions years ago. There are more than 5000 different species of them found in different parts of the world. Conserving dragonflies is important as they considered as a valuable environmental indicators.

Dragon flies are found in the areas where water is available and near grasslands. Their life cycle is an example of an incomplete metamorphosis. The dragon flies lays their eggs near the water or in the water. Dragon flies spends most of the life time as a nymph in the water where they turn into an adult and leave the water. The dragon flies rely on the aquatic ecosystems all through their life. Thus dragonflies are an important indicators of the environment and water quality.

Most of the life cycle of the dragon flies depend on the availability of water and its quality. Polluting water and destroying their habitat will result in the decline of the population of the dragon flies.

5 0
2 years ago
what do you think might happen to the pressure in the pump during filling of the valve in the right flow tube become leaky
lutik1710 [3]

The pressure will decrease when valve in the right flow tube become leaky.

<h3>What is Pressure?</h3>

This is defined as the force per unit area of a substance.  Volume is directly proportional to the pressure of a substance.

When there is a leakage, the volume decreases which leads to a corresponding decrease in the pressure.

Read more about Pressure here brainly.com/question/25736513

5 0
2 years ago
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