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amm1812
3 years ago
9

A cerebral hemorrhage may be caused by a localized weakness in a blood vessel wall that dilates and bursts. this weak section of

blood vessel is called a(n) _________
Biology
1 answer:
Artemon [7]3 years ago
8 0
This weak section of blood vessel is called an ANEURYSM. Aneurysm is defined as an excessive localized enlargement of an artery which is caused by the weakness of the artery wall. This weakness allows the artery to increase in size abnormally. 
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Check all that apply as characteristics of myelinated axons. Check All That Apply Myelinated axons transmit nerve impulses via c
stiv31 [10]

Answer:

Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter.

Myelinated axons are more energy efficient than unmyelinated axons.

Explanation:

Neurons are cells that specialize in transmitting messages to each other using a type of electrical signal. These signals carry information from outside your body to the brain, while others are the instructions for the various organs, glands and muscles to carry out functions.

Neurons receive these signals from other neighboring neurons through their dendrites. The signal then travels to the soma of the neuron, which is the main body of the cell, and finally<u> travels down the axon to the synaps</u>e (space between the end of a neuron and another cell). The axon is a neuronal extension through which the electrical signal travels, extending from the soma to other neurons.

<u>There may be layers of myelin, which consist of a layer of fat, covering the axons and where they have the function of acting as insulators to help keep the electrical signal inside the cell, which makes it move faster increasing the speed of transmission of the nerve impulse</u>.

1) Myelinated axons transmit nerve impulses via continuous conduction. FALSE. In the axon, nodes of Ranvier are found at regular intervals along the length of the axon in the myelin sheath that surrounds it. These are small spaces that expose the axon membrane to the extracellular fluid and serve to allow the nerve impulse to travel faster, in a jumping manner and with less chance of error.

2) Myelinated axons transmit nerve impulses in the same manner as unmyelinated axons. FALSE. In an unmyelinated axon, the movement of voltage across the membrane is due to ion flux that is limited by the time it takes for sodium ions to diffuse into the axon. Myelinated axons conduct faster because they are shorter than unmyelinated axons. In the latter, transmission is continuous but slower.

3) Myelinated axons utilize fewer voltage-gated channels than unmyelinated axons of the same length and diameter. TRUE. The action potential conduction jumps from node to node, thereby they need fewer voltage-gated channels. Unmyelinated axons need voltage-gated channels in along the entire axon.

4) Myelinated axons are more energy efficient than unmyelinated axons. TRUE. The rate at which sodium input through one node can depolarize the axon at the next node is related to the current and capacitance across the membrane. Myelinated axons have faster action potential conduction because it jumps from node to node, thereby they use less energy because they don't have to travel the entire length.

5) Myelinated axons would be unaffected by diseases that attack the CNS. FALSE. For example, Multiple sclerosis (MS) is a demyelinating disease of the CNS in which the immune system attacks the myelin sheath or the cells.

6 0
3 years ago
Bacteria can reproduce quickly by means of binary fission. Because of this, after binary fission
Dahasolnce [82]

C) all the offspring will be genetically identical.

Explanation:

During binary fission, all the offspring will be genetically identical and little to no variation occurs.

Binary is an asexual form of reproduction which does not involve the combination of gametes from the parents.

  • During binary fission, the parent simply divides to produce young ones.
  • In this process, the offspring replicates the genetic component of the parents making it identical.
  • The offspring is a direct copy of the parents.
  • It is only in sexual reproduction that genetic materials are exchanged between the parents and offspring. This leads to genetic variation.

Learn more;

Asexual reproduction brainly.com/question/9424950

#learnwithBrainly

6 0
3 years ago
Read 2 more answers
How are all living things classified
disa [49]
There are 7 levels of classification for Animals. Kingdom, Phylum, Classes, Order, Families, Genus, and Species. 
5 0
3 years ago
Read 2 more answers
In the presences of oxygen, the energy rich products of glycolysis in human cells
beks73 [17]
Answer

In the presence of oxygen two energy products are produced, these are:
1. ATP
2. NADH2

One NADH2 produce three ATP. 
Conclusion:
so in the presence of oxygen the energy rich compound which is produced during glycolysis is NADH2.


8 0
3 years ago
During meiosis diploid cells will divide to produce four haploid cells.<br> T or F?
alekssr [168]
A diploid cell<span> has two of each chromosome, one from each parent. In meiosis you start with a </span>diploid cell<span> that divides twice to </span>produce<span> four </span>haploid cells<span>.  So True.</span>
5 0
3 years ago
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