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Answer:
When we smoke the smoke of the cigarette contains nicotine compounds which get into our lungs and from there it makes it's way into our blood stream. This causes constriction of our blood vessels when the diameter of our blood vessels becomes less the area through which the blood travels becomes less than healthy vessels thus the blood has to travel with greater velocity to maintain the same flow of nutrients and oxygen to the tissues of our body. The faster moving blood exerts a greater force on the walls of the vessels of our body thus the pressure of blood increases.
Arteries are the type of blood vessels that are affected by nicotine smoking.
Weight training has the biggest effect on the skeletal muscles (D). The skeletal muscles are the muscles which keep the various bones in our skeleton together allowing us to stand, sit down, lie down and move. People do weight training to strengthen these muscles allowing them to be more active and pick up heavier items etc. If we don't strengthen out skeletal muscles we will battle to keep ourselves upright. We don't have to weight train but we do have to exercise and work at strengthening our skeletal muscles
You should measure you level of flexibility in order to know you limits in terms of stretching your body and immersing yourself to different sports that require more physical effort. Flexibility here refers to the absolute range of movement your joints and muscles will come across. You will be in motion.
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