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____ [38]
3 years ago
11

Explain the distinct differences between a bacterium and an animal cell.

Biology
1 answer:
Vesnalui [34]3 years ago
5 0
Bacteria cell has chromosomal and plasmid dna and is prokaryotic (without a nucleus). Animal cell is eukaryotic (with a nucleus).

Bacteria cell has cell wall and cell membrane, but animal cell only has cell membrane.

Bacteria cell has no mitochondria, animal cell does.

Bacteria cell has flagella, animal cell doesn’t.
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View the animation below, then complete the quiz to test your knowledge of the concept. conducting of the heart
valina [46]
1. In the heart, an action potential originates in the (E) sinoatrial node.
The cardiac action potential is a term referring to the change in the membrane potential of heart cells causing the heart to contract. Cardiac action potentials are created by a group of specialized cells capable of generating automatic action potentials and are located in the right atrium of the heart. These cells are called sinoatrial node and sometimes are referred to as the natural pacemaker of the heart. This characterization originates from the fact that sinoatrial node continuously provides action potential and sets the rhythm of the heart function.

2. The sequence of travel by an action potential through the heart is (A) sinoatrial node, atrioventricular node, atrioventricular bundle, bundle branches, Purkinje fibers.
As explained above, the cardiac action potential originates from the sinoatrial node. This action potential then travels through the atrioventricular node, which belongs to the electrical conduction system of the heart and is located between the atria and the ventricles. It is responsible for the electrical connection between the right atrium and the right ventricle. The action potential then travels to the atrioventricular bundle (or bundle of His), another part of the electrical conduction system of the heart. The atrioventricular bundle transmits the electrical impulses from the atrioventricular node to the bundle branches. The bundle branches then send the signal to the Purkinje fibers which send the electrical impulses to the ventricles, causing them to contract. 

3. The correct answer is A.
The generation of an action potential in the sinoatrial node causes the contraction of the atria. When the action potential passes from the sinoatrial node to the atrioventricular node, it slows down. This causes the transport of the electrical impulse from the atria to the ventricles to slow down. This delay enables the blood (from the contraction of the atria) to fill the ventricles before their contraction. 

4. This statement is true.
The interventricular septum is a structure which divides the two ventricles of the heart and it is composed of two branches, the left bundle and the right bundle branch. When the action potential reaches the interventricular septum, it then travels to the apex of the heart from where it travels upwards along the walls of the ventricles and the ventricular contraction begins.

5. This statement is true.  
The bundle branches gradually become Purkinje fibers located in the interior of the ventricular walls. Purkinje fibers are specialized cells and are responsible for conducting cardiac action potentials from the bundle branches to the ventricular walls. This signal transduction causes the muscle of the ventricular walls to contract. 
7 0
3 years ago
Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. UV radiation is called ultraviolet
Natali [406]
<span>1) It has a wavelength which is </span>smaller than violet radiation.

2) What is one factor involved in this erosion? <span>changing tides </span>
5 0
3 years ago
​untreated gastroesophageal reflux increases the risk for the more serious condition known as ____.
vovikov84 [41]
It is known as Barrets esophagus 
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2 years ago
This biome contains plants that are adapted to prevent water loss due to the low average rainfall and high temperatures year-rou
sladkih [1.3K]

Answer:

This is a Desert Biome.

Explanation:

  • There are hot deserts and cold desert.
  • Here the question is stating about the hot deserts.
  • Hot deserts are characterized by extremely hot and arid climate.
  • Average annual range of rainfall is as low as 25 cm.
  • Deserts lack vegetation except at some patches.
  • Plants that survive in hot deserts have several adaptation to check the loss of water through transpiration.
  • These adaptation include, succulent stems, cuticularized epidermis, Reduction of leaves into spines or thorns, stems modified into phylloclades and deep roots to absorb water.  
3 0
3 years ago
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Some objects in space are created from clouds of gas and dust. What will happen if the cloud does not have enough mass?
Westkost [7]

Some objects in space are created from clouds of gas and dust. A star forms when the mass of the dust cloud is large and has enough hydrogen to start creating a protostar and sustain the nuclear fusion reaction within the core of the protostar. If the dust cloud is not dense enough, then the star formation does not take place, rather a nebula is formed, example the Horse-head nebula. So the answer is (B) A star will not form.

6 0
3 years ago
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