Question

1. how does the papillary response prevent injury? what would happen without it?
2. why is the blinking response effective? what kind of job would you have where you used this reflex quite often?
3. what kind of job would you have where you would want to stop the blinking response?
4. name three sports or occupations where having a fast reaction time is important.
5. give three examples of things that could slow down your reaction time or reflexes.
6. say that a person catches a meter stick very slowly when their hands are cold. if that person was able to average catching the meter stick at 93 cm, what is their reaction time? show your work below.

Explanation:

Step1: Recall the free - fall formula

The distance an object falls under free - fall is given by $d = v_0t+\frac{1}{2}gt^2$. For an object starting from rest ($v_0 = 0$), the formula simplifies to $d=\frac{1}{2}gt^2$, where $d$ is the distance fallen, $g$ is the acceleration due to gravity ($g = 9.8\ m/s^2$), and $t$ is the time.

Step2: Rearrange the formula to solve for time

Starting with $d=\frac{1}{2}gt^2$, we can solve for $t$. First, multiply both sides by 2 to get $2d = gt^2$. Then, divide both sides by $g$: $t^2=\frac{2d}{g}$. Taking the square - root of both sides gives $t=\sqrt{\frac{2d}{g}}$.

Step3: Convert the distance to SI units

The distance $d = 93\ cm=0.93\ m$.

Step4: Substitute the values into the formula

Substitute $d = 0.93\ m$ and $g = 9.8\ m/s^2$ into $t=\sqrt{\frac{2d}{g}}$. So, $t=\sqrt{\frac{2\times0.93}{9.8}}=\sqrt{\frac{1.86}{9.8}}\approx\sqrt{0.1898}\approx0.436\ s$.

1. The papillary response adjusts the size of the pupil. In bright light, the pupil constricts to prevent too much light from entering and damaging the retina. Without it, excessive light could cause photoreceptor damage, leading to vision problems.
2. The blinking response is effective because it protects the eyes from foreign objects, dust, and excessive light. Jobs like a welder, where there are sparks and intense light, require frequent use of this reflex.
3. A job where you might want to stop the blinking response could be a precision micro - surgeon, as blinking could interrupt the delicate work.
4. Three sports or occupations where fast reaction time is important are: a) Fighter pilots, who need to react quickly to changing flight conditions; b) Tennis players, who must react to the ball's speed and direction; c) Emergency room doctors, who need to quickly assess and treat patients.
5. Three things that could slow down reaction time or reflexes are: a) Alcohol consumption, which depresses the central nervous system; b) Lack of sleep, which impairs cognitive and physical functions; c) Certain medications, such as sedatives.

Answer:

The reaction time is approximately $0.44\ s$.