The nerves of the somatic nervous system connects to which two parts of the body? a. motor muscles and chemical receptors b. heart muscles and sensory receptors c. cranial muscles and motor receptors d. skeletal muscles and sensory receptors

Correct D) Skeletal muscles and sensory receptors

Somatic nervous system is a part of peripheral nervous system which is responsible for carrying motor and sensory information in and out of central nervous system. It is connected to skin, sensory organs and skeletal muscles.

The somatic nervous system consist of two basic types of neurons called as sensory neurons and motor neurons.

Sensory neurons: These neurons are also called as afferent neurons that carry information from nerves to central nervous system.

Motor Neurons: These neurons are also called as efferent neurons, which carry information from brain and spinal cord to muscles fibers across the body.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.