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Results for: 'the rising phase'
Phases of an Action Potential - Resting Potential, Threshold, Rising, Falling, & Recovery Phases
By: HWC, Views: 7140
In this tutorial, we will review the phases of an action potential measured from a small area of a neuron's membrane. The action potential can be divided into five phases: the resting potential, threshold, the rising phase, the falling phase, and the recovery phase. When the neuron is at rest,...
Uterine (menstrual) cycle - phases
By: HWC, Views: 7708
• 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: 8145
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...
Hormones and the menstrual cycle Animation
By: HWC, Views: 4646
Feedback loops to the hypothalamus and pituitary gland from the ovaries during the menstrual cycle Animation for a step-by-step explanation. Production of a releasing hormone (GnRH) by the hypothalamus prods the pituitary's anterior lobe to release FSH and LH. In the ovary, FSH and LH stimula...
By: HWC, Views: 8059
• 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...
Control of ventilation rate by other brain centers (posts, hypothalamus & cerebral cortex)
By: HWC, Views: 7666
Forced ventilation: • The inspiratory area stimulates accessory inspiratory muscles. • Inspiration is more forceful. • Inspiratory area activates expiratory area, which sends impulses to the expiratory muscles (internal intercostals and abdominal muscles). • Expiration muscles c...
Stages of Mitosis - Prophase, Prometaphase, Metaphase, Anaphase & Telophase
By: HWC, Views: 7426
In mitosis, the nucleus divides to produce two nuclei that are genetically identical to each other and to the parent nucleus. To prepare for division, the DNA replicates in the preceding interphase. Although the chromosomes are not yet compacted and visible as discrete bodies, we illustrate them ...
Hormonal regulation of pregnancy - weeks 2 through 38
By: HWC, Views: 8146
Weeks 2 through 16 • During the first few months of pregnancy, estrogen and progesterone are secreted primarily by the corpus luteum. • These hormones act to maintain nutritional support for the embryo and fetus. • hCG production increases, peaking at 8 weeks. • hCG triggers the c...
Neurotransmission at chemical synapses & Excitory and inhibitory potentials
By: HWC, Views: 7647
• A series of events occur at chemical synapses in order to communicate with the adjacent cell. • The action potential arrives at the presynaptic membrane. • The depolarization phase of the action potential opens voltage gated Ca+ channels. • increased inflow of Ca+' into the cyto...
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