week 3 quiz Flashcards
What bodily functions cannot be voluntarily controlled?
Goose bumps, stomach gurgling, sweating, fainting, heart thumping, blushing, etc. pupillary, bladder, bowel, sexual function.
What are these autonomic functions mediated by?
Efferent (motor ) signals from the CNS. Parasympathetic and sympathetic divisions of the ANS
What are some of the work orders for autonomic action?
Baroreceptor afferents report details of blood pressure, sweating, blushing
What work does the ANS perform?
Smooth muscle contraction
Gland secretion
Cardiac regulation
All of the uncontrollable bodily activities results from one or more of these activities
What are the “work orders” that cause” housekeeping” nerves to perform some kind of job?
Some kind of sensory receptor must bring sensory information to the “housekeeping office” integration center of the reflex before the appropriate work order can be carried out (efferent limb of the reflex).
Which of the afferent impulses are triggered by sensations like pain, fullness of the stomach, or light shining in the eyes? Which are triggered by memories, thoughts, or emotions such as anxiety, hatred, or sexual attraction?
Afferent limb of the ANS reflex can be any type of:
peripheral sensation—chemoreceptor input, baroreceptor input, visceral sensation.
cerebral hemispheres—cortex, limbic system, hypothalamus
what is the function of the hypothalamus?
Hypothalamus is the headquarters or main housekeeping office. It regulates homeostatic functions—food and fluid intake influence sympathetic and parasympathetic output
what are the five “branch offices” under the control of the hypothalamus?
spinal cord, brainstem, limbic system, thalamus, conscious brain (cortex)
what is the function of the spinal cord?
integrates reflexes involved with urination, defecation, erection, ejaculation
what is the function of the brainstem?
integrates cardiovascular, respiratory, and swallowing. Chemoreceptors, baroreceptors report there, cranial nerves with ANS function originate there.
what is the function of the limbic system?
—“gut feelings”, moods, memories
what is the function of the thalamus?
integrates sensory input
what is the function of the conscious brain?
feelings and thoughts can cause autonomic responses
What 2 things are primarily responsible for making arterial blood pressure increase or decrease?
The rate at which the blood is pumped into the arteries by the heart and the resistance to blood flow within the arteries are primarily responsible for changes in arterial blood pressure.
What areas of the brain are involved with the baroreceptor reflex?
Vasomotor center and vagal center
