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.
Experiment: Action of Gastric Proteases (contains pepsin and renin on proteins)
Procedure:
1. Prepare 3 test tubes and place 2 mL boiled egg albumin solution on each tube.
Tube 1: Add 1 mL Pepsin Solution
Tube 2: Add 1 mL of Pepsin + 2 drops conc. HCl
Tube 3: add nothing
2. Keep all the test tubes in a beaker with hot water maintained at 40°C, for one hour or longer.
3. Filter the content of each test tube and perform Biuret’s Test by adding 2 mL 10% NaOH and 2 mL
dilute CuSO4 solution to each test tube.
Question: What are the possible observations on each test tube? and What is its inference?
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