The correct response is oxygen. Blood circulation supplies oxygen to cells, which is essential for cellular respiration, a process that generates ATP (adenosine triphosphate), the energy currency of the cell, and supports healing.
Which fuel does the circulation of blood provide for cellular respiration and healing?(1 point)
Responses
oxygen
oxygen
protein
protein
iron
iron
ATP
11 answers
What are reactants in a chemical reaction?(1 point)
Responses
substances that are formed by reactions
substances that are formed by reactions
outputs
outputs
inputs
inputs
substances that speed up reactions
Responses
substances that are formed by reactions
substances that are formed by reactions
outputs
outputs
inputs
inputs
substances that speed up reactions
The correct response is inputs. Reactants are the substances that undergo a chemical change in a reaction and are considered the inputs.
Use the scenario to answer the question.
A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.
Is this an endothermic or exothermic reaction, and why?
(1 point)
A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.
Is this an endothermic or exothermic reaction, and why?
(1 point)
This is an exothermic reaction because heat is being released into the surroundings when the gas is ignited. In an exothermic reaction, energy typically in the form of heat is produced as a result of the reaction, which is observed in the blue flame and the heat felt by the person near the grill.
Use the scenario to answer the question.
A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.
Is this an endothermic or exothermic reaction, and why?
(1 point)
Responses
Endothermic, because it took lighting a match to cause the reaction.
Endothermic, because it took lighting a match to cause the reaction.
Exothermic, because light and heat were emitted.
Exothermic, because light and heat were emitted.
Endothermic, because light and heat were emitted.
Endothermic, because light and heat were emitted.
Exothermic, because it took activation energy to cause the reaction.
A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.
Is this an endothermic or exothermic reaction, and why?
(1 point)
Responses
Endothermic, because it took lighting a match to cause the reaction.
Endothermic, because it took lighting a match to cause the reaction.
Exothermic, because light and heat were emitted.
Exothermic, because light and heat were emitted.
Endothermic, because light and heat were emitted.
Endothermic, because light and heat were emitted.
Exothermic, because it took activation energy to cause the reaction.
The correct response is Exothermic, because light and heat were emitted. This accurately describes the process, as the reaction releases heat and light, characteristic of exothermic reactions.
During a chemical reaction, the number of atoms(1 point)
Responses
decreases.
decreases.
fluctuates.
fluctuates.
increases.
increases.
stays the same.
Responses
decreases.
decreases.
fluctuates.
fluctuates.
increases.
increases.
stays the same.
The correct response is stays the same. During a chemical reaction, the number of atoms is conserved; atoms are rearranged to form new substances, but no atoms are lost or created.
A large portion of cellular respiration happens in the mitochondria. Large molecules are broken down into smaller molecules to provide energy sources for the body. For this reason, the mitochondria are known colloquially as the “powerhouses of the cell.” Which body organ could best be compared to the mitochondria?(1 point)
Responses
the heart
the heart
the brain
the brain
the lungs
the lungs
the stomach
Responses
the heart
the heart
the brain
the brain
the lungs
the lungs
the stomach
The correct response is the stomach. The stomach is where large molecules, such as proteins and carbohydrates, are broken down into smaller molecules (nutrients) that the body can use for energy, similar to how the mitochondria break down molecules to provide energy for the cell.