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Phases of the ovarian cycle

By: HWC, Views: 8088

• The ovarian cycle is a monthly sequence of events, consisting of three phases: • Preovulatory • Ovulatory • Post ovulatory Preovulatory phase • prior to ovulation: Primary follicles develop into secondary follicles. • Follicular cells surrounding the primary oocyte In...

Uterine (menstrual) cycle - phases

By: HWC, Views: 7732

• The uterus goes through a cyclical developmental pattern to be ready for implantation and support of an embryo. • The uterine, or menstrual, cycle is under the control of ovarian horrnones. • The uterine cycle also has three phases: • Menstrual phase • Proliferative phase â€...

Summary of female reproductive cycle days 1-28

By: HWC, Views: 8171

â–  The first five days of the cycle include the menstrual phase. â–  Progesterone and estrogen levels are low. â–  Menses occurs. â–  GnRH pulses more frequently promoting FSH and LH levels to rise. â–  Primary follicles are stimulated to develop. â–  Days five through thirteen consist o...

Mechanisms of capillary exchange

By: HWC, Views: 7900

â–  The primary role of capillaries is to permit the exchange of nutrients and wastes between the blood and tissue cells (via interstitial fluid). â–  Oxygen and nutrients move from the blood to the cells. â–  Carbon dioxide and other wastes move from the cells to the blood. The three ba...

The primary factors that affect circulation - MABP, CO and SVR

By: HWC, Views: 8078

Introduction Blood flow is determined by the relative intensities of factors that drive and resist moving blood. • Cardiac output (CO) equals the mean arterial blood pressure (MABP, a driving force) divided by systemic vascular resistance (SVR, a resisting force). • Hormones and the cen...

Neural regulation of blood pressure - baroreceptor and chemoreceptor reflexes

By: HWC, Views: 8012

• The nervous system regulates blood pressure with two reflex arcs: baroreceptor and chemoreceptor. ■ Baroreceptors (pressure) and chemoreceptors (chemical) are located in the carotid sinus and aortic arch. • Carotid sinus reflex helps maintain normal blood pressure in brain. • Ba...

Hormonal regulation of blood pressure - RAA system

By: HWC, Views: 8175

■ Long-term regulation of MABP is under hormonal control. • Hormones that affect blood pressure and volume: the renin-angiotensin-aldosterone (RAA) system, antidiuretic hormone (ADM), and atrial natriuretic peptide (ANP). ■ Most important hormonal regulator of MABP. Activated by drop in...

Angiotensin II - kidneys, adrenal glands and dehydration

By: HWC, Views: 7879

• Angiontensin II targets cells in the proximal convoluted tubule of the nephron. ■ The reabsorption of Na+ and Cl- ions sets up an osmotic gradient favoring the retention of water. • Decreases urine production and increases blood volume and pressure. • Angiontensin II targets zon...

Regulation of GFR: autoregulation via myogenic mechanism Myogenic mechanism

By: HWC, Views: 9215

• GFR can be regulated by adjusting: • Blood flow in and out of the glomerular capillaries. • Surface area of glomerular capillaries. • There are three main ways to make these adjustments: • Renal autoregulation. • Nervous regulation. • Renal autoregulation occurs when...