1.) The sympathetic nervous system secretes epinephrine at its axon terminals in the internal organs and the adrenal medulla secretes it into the bloodstream . Which of the following statements which compare the two sources of epinephrine is (are ) correct ? 1. Epinephrine from the sympathetic system is released faster . 2. Epinephrine from the sympathetic system is released more slowly 3. The effects of epinephrine from the adrenal medulla last longer . 4. The effects of epinephrine from the adrenal medulla disappear more quickly a.) 3 only B.) 1 only C.) 1 and 3 D.) 2 and 4 2.) The nervous system and the endocrine system are very closely related in the way they maintain homeostasis One of the important shared characteristics is that they both A.)send information through the body via action potentials B.) send information through the body via the blood stream C.) function independently of conditions in the external environment D.) produce chemicals that affect target cells
Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
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