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alukav5142 [94]
3 years ago
11

To achieve the maximum benefit for the heart when exercising, your heart rate (in beats per minute) should be in the target hear

t rate zone. The lower limit of this zone is found by taking 70% of the difference between 220 and your age. The upper limit is found by using 85%. Source: Physical Fitness.
a. Find formulas for the upper and lower limits (u and l) as linear equations involving the age x.
b. What is the target heart rate zone for a 20-year-old?
c. What is the target heart rate zone for a 40-year-old?
d.Two women in an aerobics class stop to take their pulse and are surprised to find that they have the same pulse. One woman is 36 years older than the other and is working at the upper limit of her target heart rate zone. The younger woman is working at the lower limit of her target heart rate zone. What are the ages of the two women, and what is their pulse?
e. Run for 10 minutes, take your pulse, and see if it is in your target heart rate zone.
Biology
1 answer:
Alina [70]3 years ago
3 0

Answer: im confused

Explanation:

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blsea [12.9K]

Answer:

C. Osmosis

Explanation:

Osmosis is the net movement of solvent molecules, usually water, from a region of lower solute concentration to a region of higher solute concentration through a partially permeable membrane. Osmosis is a very useful for moving materials in and out of the cell.

Solutions are mixtures of solutes and solvents. The main aim of osmosis is for all the mixture part to be uniform and the solvent equally dispersed to all the part of the solution.

Osmosis is controlled to a large extent by concentration gradient.

Diffusion on the otherhand is the movement of molecules of a substance from one position to another.

Facilitated diffusion and active transport are just mechanisms for transport within a cell or a body.

4 0
3 years ago
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Can we say that fish takes oxygen from h2O leaving hydrogen.​
melisa1 [442]

Explanation:

the oxygen that fish breathe is not the oxygen in H2O.Instead,the fish are breathing O2(oxygen gas) that is dissolved in water. ...Plus water is a lot heavier and thicker than air,so it takes a lot more work to move it around. please mark me braneliest

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3 years ago
Select the correct answer from each drop-down menu.
4vir4ik [10]

Explanation:

Amylase is a digestive enzyme secreted and is responsible for breaking down <u>starch.</u>

Digestion describes the intake, chemical and physical breakdown, absorption of nutrients and excretion of food.  Alpha amylase, an enzyme produced in the pancreas, is found in human saliva; it catalyzes the breakdown of starch into glucose

Further Explanation:

Food is chemically and mechanically broken down into into smaller particles. This begins in the mouth, where food is mechanically crushed by the teeth, and mixed with saliva to allow water based enzymes like lingual lipase and amylase to work;- it's then transported to the stomach via the esophagus.

Alpha amylase, an enzyme produced in the pancreas, is also found in human saliva; it catalyzes the hydrolysis, or breakdown of starch into glucose in the stomach as gastric amylase. Amylase acts on polysaccharides bonds at random points along the chain by splitting the α 1-4 glycosidic bonds.

Learn more about digestion at brainly.com/question/12328001

Learn more about Fats and calories at brainly.com/question/10071175

Learn more about ATP formation at brainly.com/question/7442284

#LearnWithBrainly

7 0
3 years ago
An unconformity is a ______ of rock.
wlad13 [49]
<span>An unconformity is a break in the geologic record. These unconformities are created in cases when rock layers erode or sedimentation does not occur for a long period of time. </span>
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3 years ago
Name two minerals elements that are necessary in the synthesis of chlorophyll​
Degger [83]

Answer:

Iron and Magnesium are the elements

4 0
2 years ago
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