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Male Reproductive System - The gonadotropin releasing hormone

By: HWC, Views: 10451

• Hormonal mechanisms that influence male reproductive function involve endocrine tissues contained in the: • Hypothalamus of the brain. • Anterior pituitary. • Testes. • In the hypothalamus, certain neurosecretory cells secrete gonadotropin- releasing hormone (GnRH). • GnRH ...

Role of the respiratory system - effect of altered ventilation rates

By: HWC, Views: 10216

• The respiratory system regulates blood pH by controlling the amount of carbon dioxide removed from the blood. • Near systemic cells, carbon dioxide forms bicarbonate ions in the blood. H+ ions are also released, thereby decreasing blood pH. • At the alveolar capillaries, bicarbonate io...

Metabolic Rate, Heat and Thermoregulation - response to heat and cold stresses

By: HWC, Views: 9839

• A neuron group in the anterior portion of the hypothalamus controls heat balance. • Neurons in the preoptic region of the hypothalamus integrate signals that come from thermoreceptors. • The temperature control center in the preoptic region propagates control signals to two other part...

Fetal Development of the Cardiovascular System

By: Administrator, Views: 12425

How the heart develops in the uterus.

Male Pelvis Animation

By: Administrator, Views: 364

The male pelvis is shaped like a funnel, forming a narrower outlet than the female. The bones are generally thick and heavy and more suited for lifting and running.

Anaphylaxis Animation

By: Administrator, Views: 12410

Anaphylaxis is a serious, life-threatening allergic reaction. The most common anaphylactic reactions are to foods, insect stings, medications and latex. If you are allergic to a substance, your immune system overreacts to this allergen by releasing chemicals that cause allergy symptoms.

Negative Feedback Regulation of Blood Pressure

By: HWC, Views: 9632

stimulus • Blood pressure determines the flow of blood to and from capillaries. • Low blood pressure results in reduced blood flow. • High blood pressure can cause blood vessels to break. Baroreceptors • The aortic arch carries blood to the body. • The common carotids ca...

Female Pelvis Animation

By: Administrator, Views: 1458

The female pelvis is shaped like a basin; can be oval to round, and is wider than the male pelvis. Designed to accommodate the average fetus during pregnancy and to facilitate its downward passage through the birth canal during childbirth.

Gas exchange - driving force

By: HWC, Views: 9645

• The respiratory system is responsible for the movement of gases involved in cellular metabolism. • Oxygen is used up and carbon dioxide is generated during the aerobic breakdown of glucose and other fuel molecules in order to produce ATP. • Three important continuous physiological pro...