Table of Contents
- 1 Why do you immediately remove your hand if you touch a hot object?
- 2 What is the example of reflex action?
- 3 What is an example of a reflex action?
- 4 Which of the following is a reflex movement?
- 5 What is a reflex action that does not involve the brain?
- 6 Why is the response time of a reflex action so fast?
Why do you immediately remove your hand if you touch a hot object?
When we touch any hot object we immediately withdraw our hands, this is due to phenomenon known as reflex action. In reflex action, sensory nerve endings present in our skin detect the heat and transfer the signal to the spinal cord. The spinal cord then coordinates the response and causes the muscles to move.
Are reflex actions controlled by the brain?
A reflex arc is a neural pathway that controls a reflex. In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. The brain will receive the sensory input while the reflex is being carried out and the analysis of the signal takes place after the reflex action.
Which portion of a reflex arc is the only portion that is found entirely within the CNS?
interneuron
The (d) interneuron is most likely to be located entirely within the central nervous system.
What is the example of reflex action?
A few examples of reflex action are: When light acts as a stimulus, the pupil of the eye changes in size. Sudden jerky withdrawal of hand or leg when pricked by a pin. Coughing or sneezing, because of irritants in the nasal passages.
What is a synapse?
synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. synapse; neuron.
Which is controlled by reflex action?
Receptors are excited at the onset of a reflex arc. They then transmit messages to the spinal cord from a sensory neuron, which is then passed on to a motor neuron. The spinal cord connects the brain and the spinal nerves. So we can say that, reflex arc is controlled by the spinal cord.
What is an example of a reflex action?
In which reflex is there a quick contraction?
The stretch reflex (myotatic reflex), or more accurately “muscle stretch reflex”, is a muscle contraction in response to stretching within the muscle. The reflex functions to maintain the muscle at a constant length.
Which is a reflex?
A reflex is an involuntary and nearly instantaneous movement in response to a stimulus. The reflex is an automatic response to a stimulus that does not receive or need conscious thought as it occurs through a reflex arc. Reflex arcs act on an impulse before that impulse reaches the brain.
Which of the following is a reflex movement?
A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain….Reflexes involving cranial nerves.
| Name | Sensory | Motor |
|---|---|---|
| Accommodation reflex | II | III |
| Jaw jerk reflex | V | V |
| Corneal reflex, also known as the blink reflex | V | VII |
| Glabellar reflex | V | VII |
What is neuron synapse?
synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction.
Why are reflex actions important?
Reflex actions A reflex action is an automatic (involuntary) and rapid response to a stimulus, which minimises any damage to the body from potentially harmful conditions, such as touching something hot. Reflex actions are therefore essential to the survival of many organisms.
What is a reflex action that does not involve the brain?
A reflex action follows this general sequence and does not involve the conscious part of the brain. This is why the response is so fast. The nerve pathway followed by a reflex action is called a reflex arc.
How does the neural pathway control the reflexes?
The neural pathway that controls the reflexes occurs through the reflex arc. It acts on an impulse even before it reaches the brain. There are some stimuli that require an automatic, instantaneous response without the need of conscious thought. The following diagram shows the reflex arc pathway.
How is the Babinski reflex elicit without patient participation?
The Babinski reflex is easy to elicit without sophisticated equipment. Since it is a reflex, it does not require active patient participation and therefore can be performed in patients who are otherwise unable to cooperate with the neurological exam.
Why is the response time of a reflex action so fast?
This is why the response is so fast. The nerve pathway followed by a reflex action is called a reflex arc. For example, a simple reflex arc happens if we accidentally touch something hot. Receptor in the skin detects a stimulus (the change in temperature).