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cerebellum
the left side of your brain
You can exercise your brain the same as you exercise your muscles.
Yes, any experience or behaviour can be triggered by electrically stimulating the correct part of the brain. The person might laugh because the stimulation triggered a funny memory, caused a ticklish sensation, directly activated laughing, or many other reasons.
This is your emotional brain at work.
The retina is the reflective tissue at the back of the eye on which images are projected.
The prefrontal cortex of the brain is responsible for decision making tasks.
Heartbeat is normally self regulating in resting mode, but on stimulation through anxiety, exercise etc, the sinoatrial node regulates the bodies data and adjusts the heartrate to suit.
Yes, it is basically the base of the brain; it is where the brain starts. The brain stem extends from the spinal cord into the brain and is the oldest (most primitive) part of the brain. Over time, the brain has developed on top of the brain stem to come to what it is today (in modern humans).
For the most part the brain doesn't directly control the urinary system but their is some control over the rate of glomerular filtration by the sympathetic nervous system.
brain
Breast stimulation in any form is usually considered a part of foreplay or supplementary to sex, but not sex itself, which generally refers to stimulation of the genitalia. Oral sex is oral stimulation of the genitalia. Breasts are secondary sexual characteristics, NOT genitalia. Breast stimulation is still a sexual activity/behavior though even if not 'sex' itself.