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dmitriy555 [2]
3 years ago
14

The myelin sheath that covers many cns axons is formed by

Biology
1 answer:
nirvana33 [79]3 years ago
4 0

The myelin sheath that covers many cns axons is formed by oligodendrocytes.

Oligodendrocytes are type of neuroglia (non-neural cells found in central nervous system) with protective, trophic and supportive role. Their function is to insulate axons (with myelin sheath), in the central nervous system (CNS) which is, equivalent to the function performed by Schwann cells in the peripheral nervous system (PNS).

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Match the following groups to their descriptions:
jonny [76]

Answer:

1. Archaeplastida.

2. Excavata.

3. Amoebozaons.

4. Stramenopiles.

5. Rhizarians.

6. Alveolates.

Explanation:

Protists can be defined as any group of eukaryotic organisms that belongs to the kingdom protista and are not plant, animal or fungus.

These are the six (6) groups of protists;

A. <u>Archaeplastida</u>: have a cell wall and both an outer and an inner membrane. There are no membraneous organelles in this group.

B. <u>Excavata</u>: have a feeding groove on one side and are usually single-celled. Members include organisms with heterotrophic, photosynthetic, parasitic, or symbiotic lifestyles.

C. <u>Amoebozaons</u>: use pseudopodia to move and may be either single-celled or multicellular. Members within this group exhibit free-living and parasitic lifestyles.

D. <u>Stramenopiles</u>: have a tinsel flagellum and are photosynthetic.

E. <u>Rhizarians</u>: have elaborate tests composed of calcium carbonate, silicon, or strontium salts. Members have thin pseudopodia that project from the test.

F. <u>Alveolates</u>: have membrane-enclosed sacs beneath the plasma membrane. There are photosynthetic and heterotrophic members in this group.

8 0
3 years ago
The position of the longus coli muscles is on the anterior surface of the _____, while the infrahyoid muscles lie on the anterio
timama [110]

Answer:

Cervical vertebrae (visually between the atlas and the third thoracic vertebra); larynx and trachea

Explanation:

Muscle is a contractile form of tissue which animals use to effect movement. Muscle  are largely made up of actin and myosin filaments.

Vertebrae refers to any of the small bones which make up the backbone.

Cervical vertebrae refers to any of the seven vertebrae of the neck.

Larynx is an organ of the neck of mammals involved in breath control, protection of the trachea and sound production, housing the vocal cords, and that is situated at the point where the upper tract splits into the trachea and the oesophagus/esophagus.

A trachea is a thin-walled, cartilaginous tube connecting the larynx to the bronchi; the windpipe.

The Longus colli muscle (commonly referred to as the long muscle of the neck) is a muscle on anterior surface of the cervical vertebrae.

Infrahyoid position is one that is below the hyoid bone in the neck; applied to a group of four pairs of muscles in the anterior part of the neck.

The position of the longus coli muscles is on the anterior surface of the cervical vertebrae, while the infrahyoid muscles lie on the anterior surface of the larynx and trachea.

3 0
3 years ago
Foods that contain all the essential amino acids are called
goblinko [34]
They are called proteins.
8 0
3 years ago
What is the following best defines climate?
Julli [10]
Climate is the average, year to year conditions of weather in an area
6 0
3 years ago
Fungal infections are often difficult to treat because fungi
garri49 [273]

Answer:

The answer is D

Explanation: This is because fungus are Eukaryotic unlike bacteria.  

3 0
4 years ago
Read 2 more answers
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