target cell
An erythrocyte in target cell anaemia, with a dark centre surrounded by a light band that again is encircled by a darker ring; it thus resembles a shooting target; such cell’s also appear after splenectomy.
A cell lysed by cytotoxic t lymphocytes, as in graft rejection.
Synonym: mexican hat cell.
Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you will find the basic structure of a neuron, the different classes of neurons, and membrane potentials. It also includes the structure of the nervous system...
Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory responses performed by homeostatic control systems. Know the different components of homeostatic control systems, homeostatic regulators, and the various biological processes that homeostasis entail...
The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous system, most especially its cellular features. Recognize the cellular composition of this biological system through this tutorial...
Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designed to produce them. This tutorial looks at how genes control the production of hormones within the endocrine system of animals...
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The inefficiency of any of these hormonal control systems may lead to the improper functioning of the body. In this tutorial, get to know the different classes of hormones, metabolism, mechanism, and control of hormone secretions. ..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pathogens. Read this tutorial to learn the first and second lines of defense that the human body employs. ..
