Tag: anatomy
- How The Body Controls Blood Glucose ()
In order to ensure normal body function, the human body is dependent on a tight control of its blood glucose levels. This is accomplished by a highly sophisticated network of various hormones and neuropeptides released mainly from the brain, pancreas, liver, intestine as well as adipose and muscle tissue. Within this network, the pancreas represents […]
- The Adrenal Glands ()
The adrenal medulla is the core of the adrenal gland, and is surrounded by the adrenal cortex. Secretion of hormones from the medulla is controlled by the sympathetic nervous system. The cells of the medulla are the body’s main source of the hormones adrenaline (epinephrine) and noradrenaline (norepinephrine). These hormones are part of the response initiated by the sympathetic nervous system. […]
- The Pancreas ()
The pancreas is both an exocrine gland as it secretes pancreatic juice containing digestive enzymes, and an endocrine gland as it produces several important hormones. It is located just below and behind the stomach. The endocrine cells of the pancreas are grouped together in areas called islets of Langerhans. The islets produce the amino acid-based hormones insulin, glucagon, […]
- The Endocrine System ()
The endocrine system, along with the nervous system, functions in the regulation of body activities. The nervous system acts through electrical impulses and neurotransmitters to cause muscle contraction and glandular secretion. The effect is of short duration, measured in seconds, and localized. The endocrine system acts through chemical messengers called hormones that influence growth, development, […]
- Structure of the Digestive System – The Alimentary Canal ()
At its simplest, the digestive system is a tube running from mouth to anus. Its chief goal is to break down huge macromolecules (proteins, fats and starch), which cannot be absorbed intact, into smaller molecules (amino acids, fatty acids and glucose) that can be absorbed across the wall of the tube, and into the circulatory […]
- Digestive System ()
The digestive system includes the digestive tract and its accessory organs, which process food into molecules that can be absorbed and utilized by the cells of the body. Food is broken down, bit by bit, until the molecules are small enough to be absorbed and the waste products are eliminated. The digestive tract, also called […]
- Introduction to the Nervous System ()
The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory. Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis. Through its receptors, the nervous system keeps us in touch with our environment, […]
- Peripheral Nervous System (PNS) ()
The peripheral nervous system consists of the nerves that branch out from the brain and spinal cord. These nerves form the communication network between the CNS and the body parts. The peripheral nervous system is further subdivided into the somatic nervous system and the autonomic nervous system. The somatic nervous system consists of nerves that […]
- The Central Nervous System (CNS) ()
The CNS consists of the brain and spinal cord, which are located in the dorsal body cavity. The brain is surrounded by the cranium, and the spinal cord is protected by the vertebrae. The brain is continuous with the spinal cord at the foramen magnum. In addition to bone, the CNS is surrounded by connective […]
- The Autonomic Nervous System ()
The brain has better things to do than worry about contracting the smooth muscle of the large intestine just in time for that 9 am bowel movement. The brain has better things to do than worry about how fast the metabolism is working. The brain has better things to do than worry about exactly what […]