Heart rate persons with coronary artery disease. The heart rate is rhythmically generated by the sinoatrial node. It is also influenced by central factors through sympathetic and parasympathetic nerves. Nervous influence over the heartrate is centralized within the two paired cardiovascular centres of the medulla oblongata. The cardioaccelerator regions stimulate activity via sympathetic stimulation of the cardioaccelerator nerves, and the cardioinhibitory centers decrease heart activity via parasympathetic stimulation as one component of the vagus nerve. During rest, both centers provide slight stimulation to the heart, contributing to autonomic tone. This is a similar concept to tone in skeletal muscles. Normally, vagal stimulation
Al's Brain many different styles of animation. It starts with a picture of the brain which then starts to move. It shows you that he brain is "divided into two hemispheres" and that the left side "controls your right side and your left controls your right side" which happen to be "tied together" by the Corpus Callosum, as well showing that the brain is covered with a meninges layer, cerebral spinal fluid and afterwards you are looking at the four lobes of the brain, which compose of the Frontal, the temporal, the parietal and the occipital lobes and that they are all