Table of Contents
- 1 What carries impulses from the CNS to muscles?
- 2 What nervous system controls smooth muscle?
- 3 Which nerve fibers carry impulses from the CNS to skeletal muscles?
- 4 How does the ANS control smooth muscle?
- 5 What is the function of the autonomic nervous system Quizlet?
- 6 What is the sympathetic innervation of the thoracic viscera?
What carries impulses from the CNS to muscles?
Afferent, or sensory, neurons carry impulses from peripheral sense receptors to the CNS. They usually have long dendrites and relatively short axons. Efferent, or motor, neurons transmit impulses from the CNS to effector organs such as muscles and glands.
What is the efferent subdivision that transmits impulses from the CNS to smooth muscle cardiac muscle and glands through thoracic spinal nerves?
The autonomic nervous system, also called the visceral efferent nervous system, supplies motor impulses to cardiac muscle, to smooth muscle, and to glandular epithelium. It is further subdivided into sympathetic and parasympathetic divisions.
What nerves carry impulses from the CNS to the PNS?
Cranial nerves, spinal nerves, and ganglia make up the peripheral nervous system. The afferent division of the peripheral nervous system carries impulses to the CNS; the efferent division carries impulses away from the CNS. There are three layers of meninges around the brain and spinal cord.
What nervous system controls smooth muscle?
The enteric nervous system (ENS) is responsible for controlling the smooth muscle and glandular tissue in your digestive system. It is a large part of the PNS, and is not dependent on the CNS.
What neurons carry impulses away from the CNS?
Motor neuron is the neuron that conducts impulses away from the CNS to muscles and glands.
What type of cell carries information to and from the CNS?
There are three types of neurons in the nervous system – afferent, efferent and interneurons. Afferent neurons carry signals towards the CNS – afferent means “towards”. They provide information about the external environment and the regulatory functions being carried out by the nervous system.
Which nerve fibers carry impulses from the CNS to skeletal muscles?
Chapter 7- Nervous System
| A | B |
|---|---|
| These sensory fibers deliver impulses from the skin, skeletal muscles, and joints | somatic sensory fibers |
| These sensory fibers come from visceral organs | visceral sensory fibers |
| Nerve fibers that carry impulses away from the central nervous system and activate muscles and glands | motor or efferent |
What is sympathetic and parasympathetic?
The autonomic nervous system comprises two parts- the sympathetic and parasympathetic nervous system. The sympathetic nervous system activates the fight or flight response during a threat or perceived danger, and the parasympathetic nervous system restores the body to a state of calm.
How will you differentiate the central nervous system CNS and the peripheral nervous system PNS in terms of their functions?
The Central Nervous System (CNS) includes the brain and spinal cord. The Peripheral Nervous System (PNS) connects the CNS to other parts of the body, and is composed of nerves (bundles of neurons).
How does the ANS control smooth muscle?
The complex nature of the autonomic nervous system allows for tight unconscious control of digestions, respiratory rate, urination, heart rate, blood pressure, and many other critical body functions. Ultimately innervation from the autonomic nervous system leads to a calcium release in smooth muscle tissue.
What is smooth muscle responsible for?
Smooth muscles regulate the flow of blood through arteries, arterioles, and veins, where they control the size of the lumen of the vessel. They occur in the gastrointestinal tract, where they are responsible for movements of the stomach and the peristaltic waves of the intestines.
What type of neuron carries signals from the CNS to the muscles of the body to initiate physical movement?
Motor neurons
Sensory neurons, also known as afferent neurons, are responsible for carrying information from the body to the CNS. Motor neurons, also known as efferent neurons, are responsible for carrying information from the brain and spinal cord to muscle fibers throughout the body.
What is the function of the autonomic nervous system Quizlet?
The organs of our body (viscera), such as the heart, intestines and stomach, are regulated by a branch of the nervous system known as the autonomic nervous system. The autonomic nervous system is part of the peripheral nervous system and controls the function of many muscles, glands and organs within the body.
What happens to blood pressure during contraction of smooth muscle?
Contraction of smooth muscle of the vessels will lead to constriction of the vessels, and thus increased blood pressure. Stimulation of the heart conduction system leads to an increased heart rate, thus increased cardiac output, which contributes to increasing blood pressure.
How are impulses transferred from the autonomic centers?
According to the information they bring, the autonomic centers convey efferent impulses through the visceral efferent (motor) fibers to the visceral organs and constantly regulate their function. These impulses are conveyed through ganglia and pre- and postganglionic nerve fibers.
What is the sympathetic innervation of the thoracic viscera?
Sympathetic innervation of the thoracic viscera comes from the cardiopulmonary splanchnic nerves, which contribute to cardiac, esophageal, and pulmonary plexuses. They are postganglionic fibers of the sympathetic trunk.