Chapter 7 of Class 10 Science is about "Control and Coordination." This chapter focuses on the nervous system, which plays a vital role in controlling and coordinating the functions of various organs and systems in our body.

Nervous System:
- The nervous system consists of the brain, spinal cord, and nerves.
- It is responsible for receiving and transmitting signals, and coordinating responses to stimuli.
- The brain is the main control center, while the spinal cord acts as a pathway for nerve impulses.

Neuron:
- Neurons are specialized cells that form the basic unit of the nervous system.
- They have a cell body, dendrites (receiving end), and axons (transmitting end).
- Neurons communicate with each other through electrical and chemical signals.

Central Nervous System (CNS) and Peripheral Nervous System (PNS):
- The CNS includes the brain and spinal cord, while the PNS consists of nerves that connect the CNS to different body parts.
- The PNS is further divided into the somatic nervous system (voluntary actions) and the autonomic nervous system (involuntary actions).

Reflex Action:
- Reflex action is an automatic response to a stimulus that does not involve conscious thought.
- It is controlled by the spinal cord and helps in quick and protective actions.
- The reflex arc involves a sensory receptor, sensory neuron, interneuron, motor neuron, and an effector.

Chemical Coordination:
- Hormones are chemical messengers secreted by endocrine glands.
- They regulate various bodily functions and maintain homeostasis.
- The endocrine system includes glands such as the pituitary, thyroid, adrenal, pancreas, etc.

Hormones and Their Functions:
- The pituitary gland secretes growth hormone, which regulates growth and development.
- The thyroid gland produces thyroxine, which controls metabolism.
- The adrenal gland releases adrenaline, which prepares the body for fight or flight response.
- The pancreas secretes insulin and glucagon, which regulate blood sugar levels.

Disorders of the Nervous System:
- Disorders like Parkinson's disease, Alzheimer's disease, epilepsy, and multiple sclerosis affect the nervous system.
- These disorders disrupt coordination and cause various symptoms.

In conclusion, Chapter 7 of Class 10 Science provides an understanding of the control and coordination mechanisms in our body. It covers the nervous system, reflex actions, chemical coordination through hormones, and the disorders associated with these systems.