Which of the following parts of a nervous reflex arc is usually a muscle or gland? a) sensory receptor b) sensory neuron c) motor neuron d) effector e) integration center

climate change and pollution

the median of the data is 4.5.

atp is used for energy.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]