Axons of the nervous system are described as afferent and efferent according to the direction in which they carry information. W
hich of the following represents an efferent projection? a) sensory input to the spinal cord
b) motor output of the spinal cord
c) interneurons in the spinal cord
d) sensory input to the spinal cord, motor output of the spinal cord, interneurons in the spinal cord
The correct option is b) motor output of the spinal cord
Explanation:
Motor neurons, also called afferent neurons, drive impulses from the brain and spinal cord to the receptors (eg, muscles). They are the motor output component of the spinal cord.
The spinal cord is a cord of nerve tissue that runs inside the spine. It conducts the nerve impulses that arrive from the receptors to the brain, and the responses with the motor orders from the brain to the effector organs. Thus, the brain receives the information and can develop an order that modifies the reflex response given by the spinal cord. A spinal nerve has two nerve roots: a motor and a sensory root. The motor root has nerve fibers that carry signals from the spinal cord, to the muscles to stimulate contraction and produce muscle movements, the fibers are efferent as they leave the medulla to the periphery through the anterior roots of the spinal nerves.
I'm not sure, but I'd say that the best answer choice would be B because most of the plants would grow, and none would die off. The smaller plants would grow, and would grow in, and most if not all of the larger would just continue to grow, if they aren't already full grown.
D. An ecologist publishes data funded by a construction company which supports their original hypothesis that an endangered animal's territory is not endangered.
