Where are reflex arcs primarily formed in the human body?
Spinal cord
A reflex arc is the neural pathway that produces a rapid, involuntary response to a stimulus, such as pulling the hand away from a hot object. The pathway is short: a sensory neuron carries the signal from the receptor to the spinal cord, an interneuron in the spinal cord processes it, and a motor neuron carries the command back to the muscle.
Because the signal is handled directly in the spinal cord, the response is generated before the message reaches the brain, which is what makes the action so fast. The brain is later informed of what happened but does not form the arc itself. The lungs and heart are effector organs of the respiratory and circulatory systems and have no role in forming the reflex pathway.
Hence, the answer is Spinal cord.
Which connective tissue smoothens bone surfaces at joints and is present in the ear and trachea?
In a reflex arc, which of the following represents the correct path of the impulse?
The skin on the face is primarily made up of which epithelial tissue?
Which of the following methods ensures prevention of transmission of sexually transmitted diseases during sexual intercourse?
A long-term smoker develops a chronic cough and frequent respiratory infections. Which physiological change in the respiratory tract primarily contributes to this increased susceptibility?
Which of the given statements about nervous tissue are correct?
(i) Nervous tissues are made up of neurons.
(ii) Neurons have one axon and many dendrites.
(iii) Nerve impulses are signals that pass through a nerve fibre.
In double circulation, which vessel delivers oxygenated blood to the heart?
Oxygen is transported in human blood mainly by binding with the pigment __________.
Which organ sends messages to muscles to carry out voluntary actions like writing or moving a chair?
Read the following statements are about epithelial tissue and select the most appropriate option.
Statement A: Cells of epithelial tissue are tightly packed.
Statement B: Fibrous basement membrane separates epithelium from underlying tissue.
The contractile protein in skeletal muscle is:
Protein factory in human cell is
Which of the following is the most abundant type of blood cells?
The brain region which is responsible for coordination of voluntary muscular movement posture and balance
One cardiac cycle completes in _____