Final answer:
None of the listed options is directly a reflexive effect for jostling and shaking. The conceptually closest answer is the dilatation of bronchi, as part of the sympathetic nervous system's fight-or-flight response to improve oxygen intake during stress.
Step-by-step explanation:
Physiological Effect of Jostling and Shaking
Among the listed physiological effects, none is directly a reflexive effect for jostling and shaking. However, if we were to infer the body's general reaction to violent motion or stress such as jostling and shaking, it might trigger the Sympathetic Nervous System (SNS). The SNS response, often referred to as the fight-or-flight response, could lead to physiological changes including:
- Increased heart rate
- Dilatation of bronchi
- Constriction of blood vessels in the skin
The closest answer to the reflexive effect for jostling and shaking would conceptually be dilatation of bronchi, as it is part of the body’s automatic fight-or-flight response designed to improve oxygen intake and enhance physical performance in a stressful situation. However, the provided options (increased heart rate, decreased blood pressure, constriction of pupils, dilatation of bronchi) are not specifically described as reflexive responses to jostling and shaking.