Germ cells are also diploid, but they are found only in the gonads. Gonads are the ovaries in females and testes in males. <span>Gametes are </span>haploid cells<span>, which means that they have only one set of chromosomes. </span>
Much of the coordination of vertebrate body functions via chemical signals is accomplished by the endocrine system.
The endocrine system is an information system composed of hormonal feedback loops that are secreted directly into the circulatory system by the body's endocrine glands and regulate distant target organs.
In vertebrates, the hypothalamus is the centre of neuromodulation of all endocrine systems. The main endocrine glands in humans are the thyroid and adrenal glands.
The study of the endocrine system and its disorders is called endocrinology.
The glands that send signals to each other in sequence are often referred to as the hypothalamic-pituitary-adrenal axis.
In addition to the specialized endocrine organs mentioned above, many other organs that are part of other body systems have secondary endocrine functions such as bones, kidneys, liver, heart and gonads.
For example, the kidneys secrete the endocrine hormone erythropoietin. Hormones are amino acid complexes, steroids, eicosanoids, leukotrienes, or prostaglandins.
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These are coronary veins or any structure associated with coronary veins : b. Great cardiac vein, c. Coronary sinus
, & d. Middle cardiac vein. The great cardiac vein (GCV) is the largest of the veins draining into the coronary sinus from the myocardium. The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle (myocardium). The middle cardiac vein commences at the apex of the heart; ascends in the posterior longitudinal sulcus, and ends in the coronary sinus near its right extremity. While jugular veins are any of several large veins in the neck, carrying blood from the head and face.
Darwin’s ideas operate on the basis that organisms must change to survive in their environment. One of the key aspects of these changes is that they help the organisms utilize resources as effectively as possible. If there were unlimited resources there would not be a need for change. Malthus’s studies in limited resources shows how human populations changed to best use the resources available.
