GED Science Test #8
Two spheres that are negatively charged
Two charges that are similar repel each other.
Which of the following is true about the heart?
A group of cells that spontaneously emit impulses enable the heart to beat independently of the brain. The sinoatrial node houses these cells, which is why the node is known as the "pacemaker" of the heart. The heart can continue to beat even in the absence of nerve stimulation.
Which of the following statements regarding gravity is false?
The assertion is incorrect because the gravitational force between two objects is proportional to their masses. The rest of the claims are correct and follow Newton's Law of Gravitation.
The term "phase change" refers to the process by which matter takes on a new shape (solid, liquid, gas). A phase change is defined as which of the following?
When water vapor condenses, it transforms from a gas to a liquid. Chemical reactions are involved in choices, digestion of food, and dry-cleaning, hence they aren't considered physical processes. Exhaling pushes air out of the lungs, but no phase change occurs.
Which of the following statements regarding energy and/or matter is false?
Because energy is not made up of matter, the assertion is erroneous (atoms). The rest of the statements are correct.
When a process is exothermic, heat is expelled into the environment. Burning wood is an example of an exothermic process. An endothermic process necessitates the use of heat from the environment. Boiling water is an example of an endothermic reaction. Which of the following is an example of an endothermic reaction?
An endothermic reaction necessitates the addition of heat energy. Melting ice (ice melts when heated) is the only one that requires an energy input (heat). The rest of the processes listed are exothermic, meaning they produce heat.
What is the name of the mechanism that causes food to flow through the esophagus in a manner like to a wave contracting?
The peristalsis or wave-like contraction of the esophagus helps move food into the stomach. Peristalsis is started by swallowing but unlike swallowing, peristaltic contractions are produced by smooth muscle and are not voluntary.
Which of the following types of chemical bonds includes the transfer of an electron between atoms and is particularly strong?
Ionic and covalent bonds are the two main types of bond. In contrast to covalent connections, which call for atoms to exchange an electron, ionic bonds involve the transfer of an electron between atoms. The stronger of the two bonds is an ionic bond. Covalent bonds typically develop between two non-metals, such as HCl, while ionic bonds typically form between a metal and a non-metal (such as NaCl).
What is accurate regarding the genetic code?
It is stated that the genetic code is both clear-cut and irreversible. Degenerative refers to the fact that different codons can code for the same amino acid.
Newton's laws of motion state that an item in motion will stay in motion unless a force acts on it. When you suspend an object from a string and allow it to swing, it will swing for a short time before slowing down and stopping. What causes the suspended object to come to a halt?
Because of the force of friction acting on it, the object in motion slows down and eventually stops swinging. Through friction with the air, the object's kinetic energy is transformed to heat energy.
Which heart chamber supplies the body's tissues with blood?
The heart has two atria and two ventricles, making up its four chambers. While the ventricles pump blood out of the heart, the atria are in charge of receiving blood returning from the body. While the left ventricle circulates blood throughout the body, the right ventricle delivers blood to the lungs.
What function does bile serve in digestion?
During digestion, bile is produced by the liver and discharged from the gall bladder into the small intestine. Bile aids in the process of emulsifying fat, which increases the surface area of the substance because fat tends to clump in the watery environment of the duodenum. This aids lipase in completely absorbing the fats.
Which two liquids have the potential to form an acid-base reaction?
It's the unique liquid combination where one is acidic (vinegar—pH 3) and the other is basic (bleach—pH 9).
Which of the subsequent structures does air flow through?
The lungs may receive air thanks to the respiratory system. Air enters the trachea through the mouth or nasal passages before entering the bronchi. The bronchi divide into progressively smaller bronchioles until coming to an end in tiny sacs known as alveoli.
Which digestive system organ doesn't help with the chemical breakdown of food?
In many distinct areas of the digestive system, food is partially or fully digested. The digestion of food involves the mouth, stomach, and small intestine. But the esophagus makes no contribution at all to chemical digestion.
What type of blood cells defend the body against diseases and other invading organisms?
Multiple cell types that serve different purposes in the body make up blood. Erythrocytes, or red blood cells, aid in delivering oxygen to the body's tissues. Leukocytes, or white blood cells, aid in the body's defense against bacteria and other diseases. Megakaryocytes produce platelets, which are cellular pieces that aid in blood clotting.
Because of this, ice floats on water.
Floating objects have a lower density than the substance in which they float.
In the winter, people wear woolen gloves because
Insulation is provided by gloves.
Which of the following claims regarding arteries is accurate?
The blood channels with high pressure known as arteries are in charge of transporting blood away from the heart. All of the body's arteries lead away from the heart and toward other tissues.
Which system includes the heart, which is in charge of distributing oxygenated blood throughout the body?
The circulatory system is in charge of moving waste materials, nutrients, oxygen, and blood throughout the body. The circulatory system's blood vessels are made up of arteries, arterioles, capillaries, venules, and veins. One of the main parts of the circulatory system, the heart is in charge of pumping the circulatory system's fluids through various channels.
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