Physiology Commons^™

The Neural Organization Of The Lamina Ganglionaris In The Crab Hemigrapsus Nudus A Light And Electron Microscope Study, Hsu-Cheng Huang

Loma Linda University Electronic Theses, Dissertations & Projects

The gross structure and the neural arrangements in the optic lamina of crab Hemigrapsus nudus have been studied by light microscopy Golgi techniques and by electron microscopy. The lamina from distal to proximal is composed of a distinct cell layer, a fibular synaptic region, the plexiform layer, a spares cell layer, and the first optic chiasma. Golgi preparation of the lamina reveal four types of cells contributing to the lamina synaptic layer. Retinula cell axons and terminations, monopolar neurons with perikarya in the distal cell layer, tangential cells, neurons whose primary process enters from the chiasma with secondary processes branching …

The Role Of The Parotid Salivary Glands In The Regulation Of Insulin Secretion, Kenneth L. Millard

Loma Linda University Electronic Theses, Dissertations & Projects

Stress of handling, partial or complete sialoadenectomy, and the administration of parotid hormone (PH), sodium fluoride (NaF), or guanidino-succinic acid (GSA) were examined for effects on fasting plasma glucose and insulin or effects on intravenous glucose tolerance in male Sprague-Dawley rats. Basal glucose and insulin were substantially elevated as a result of the stress of translocation in large animals, but were not altered in small animals. A rise in plasma insulin occured in control animals 20 minutes following anesthesia and the removal of a blood sample by cardiac puncture but not in animals that had been handled twice daily for …

The Effect Of Exercise On Blood Flow In Pregnant Guinea Pigs, Marjorie Correll Sladek

Loma Linda University Electronic Theses, Dissertations & Projects

Recent investigations have shown decreased fetal weight in pregnant animals who were exercised regularly during pregnancy (Gilbert; Nelson; Longo, 1979; Terada, 1974). The purpose of this experimental study was to investigate fetal weight gain and measure blood flow in pregnant guinea pigs who were exercised 45 minutes per day; and thus answer the hypothesis that prolonged maternal exercise will cause decreased weight gain and decreased placental blood flow during pregnancy.

Twenty pregnant guinea pigs were exercised 15 minutes three times daily from 10 days gestation to approximately 60-62 days gestation (67 days being term) and were compared with 19 control …

Mechanisms Of Control Of Blood Flow In The Forelimb Of Sheep, Paul J. Marks

Loma Linda University Electronic Theses, Dissertations & Projects

Although much is known about the factors involved in the control of blood flow, the cellular mechanisms of their action are poorly understood. This study investigated the mechanisms of norepinephrine, epinephrine, isoproterenol, and acetylcholine.

First, in a constant pressure/variable flow preparation we characterized the sheep brachial artery blood flow response to, and recovery from, 10-min infusions of each of these drugs. Then we used a computer model to simulate changes in blood flow in response to altered ion permeabilities or pump speeds (the mechanisms). We tried to produce responses like those to the drug infusions so that we could infer …

Comparison Of Lipid And Lipoprotein Levels In Diabetic And Non-Diabetic Juveniles Of Eastern Kentucky, Louise Mccall Isaacs

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Science and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Louise McCall Isaacs on February 27, 1981.

Full Issue, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

End Matter, Vol. 5, Index

Great Basin Naturalist Memoirs

No abstract provided.

Front Matter, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

End Matter, Vol. 5

Great Basin Naturalist Memoirs

No abstract provided.

The Development Of Effective Endothermy And Homeothermy By Nestling Piñon Jays, Larry Clark

Larry Clark

No abstract provided.

The Development Of Effective Endothermy And Homeothermy By Nestling Pition Jays, Larry Clark

Larry Clark

No abstract provided.

The Metabolic Cost Of Behavioral Thermoregulation Of Body Temperature In The Northern Alligator Lizard Gerrhonotus Coeruleus, And How It Affects The Classical Concept Of Eurythermality, James Dudley Campbell

Dissertations and Theses

The effect of total metabolic cost expenditures on the precision of behavioral thermoregulation was investigated for the purportedly eurythermic Northern Alligator lizard (Gerrhonotus coeruleus). An operant apparatus was designed to test metabolic output at different heat reinforcement magnitudes. The mean T_B reflected in each trial was positively correlated to the length of reinforcement. The shuttle rate during each trial was inversely correlated to the length of reinforcement. The standard deviation and total metabolic costs did not vary significantly between trials undertaken at the same ambient temperature. Eurythermality in G. coeruleus is caused by fluctuations in preferred body temperature and …

The Relationship Of Serum Thyroxine To The Reproductive Capabilities Of Prairie Deermice (Peromyscus Maniculatus Bairdi) From Laboratory Populations, Edgar David Peebles

Dissertations, Theses, and Masters Projects

No abstract provided.

Sodium Flux Ratio In Voltage-Clamped Squid Giant Axons, David D. Busath, Ted Begenisich

Faculty Publications

The sodium flux ratio across the axolemma of internally perfused, voltage-clamped giant axons of Loligo pealei has been measured at various membrane potentials. The flux ratio exponent obtained from these measurements was about unity and independent of membrane voltage over the 50 mV range from about -20 to +30 mV. These results, combined with previous measurements of ion permeation through sodium channels, show that the sodium channel behaves like a multi-ion pore with two ion binding sites that are rarely simultaneously occupied by sodium.

Eye Movement Related Single-Unit Recording In The Nucleus Reticularis Tegmenti Pontis In The Alert Monkey, William Franklin Crandall Jr.

University of the Pacific Theses and Dissertations

Nucleus Reticularis Tegmenti Pontis (NRTP) is a structure which lies in the mid-brain ventral to the oculomotor complex. Anatomical studies strongly implicate it in oculomotor function as most of its inputs and outputs are to systems previously shown to be intimately involved in eye movement generation--superior colliculus (SC) and cerebellum. These reports show an integrative structure with inputs and outputs distributed in a way well suited for performing relay and feedback tasks. Physiological data in the alert, trained monkey has been gathered in an attempt to characterize these neurons and to classify them in functional terms. Three monkeys were trained …