Looking at the wiggers diagram Which of the letters A-F would be the point when semilunar valves open on the left ventricle volume part of the diagram? Answers: A/F/B/E/D/C
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.
![Time (msec)
400
500
600
700
800
100
200
300
QRS
complex
QRS
complex
Electro-
cardiogram
(ECG)
120
90
Dicrotic notch
Aorta
Pressure
(mm Hg)
Left
ventricular
60
0
pressure
30-
Left atrial
pressure
Нeart
sounds
S1
s2
135
Left
ventricular
volume (mL)
65
Ventricular
diastole
Atrial
Ventricular
Atrial
systole
systole
systole
Atrial systole
Isovolumie
ventricular contraction
Ventricular systele
Early ventricular
diastele
Late ventricular
Atrial systole
diastole
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