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Related Concept Videos

Competition02:34

Competition

24.8K
When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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Sperm Transport01:15

Sperm Transport

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The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
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Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics01:11

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

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All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

2.9K
Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
2.9K
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

981
Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
Although all competitive neuromuscular blockers are designed...
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Related Experiment Video

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Two Types of Assays for Detecting Frog Sperm Chemoattraction
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Two Types of Assays for Detecting Frog Sperm Chemoattraction

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Egg chemoattractants moderate intraspecific sperm competition.

Rowan A Lymbery1, W Jason Kennington1, Jonathan P Evans1

  • 1School of Biological Sciences The University of Western Australia Crawley WA 6009 Australia.

Evolution Letters
|October 5, 2018
PubMed
Summary

Sperm chemotaxis, the attraction of sperm to eggs via chemical signals, influences fertilization success. This study provides the first direct evidence that differential sperm chemotaxis moderates sperm competition and may favor genetically compatible males.

Keywords:
Gamete interactionsgenetic compatibilitysexual selectionsperm chemotaxissperm competition

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Area of Science:

  • Reproductive Biology
  • Evolutionary Biology
  • Marine Invertebrate Biology

Background:

  • Gamete interactions are crucial for reproductive fitness, yet mechanisms of fertilization success are poorly understood.
  • Sperm chemotaxis, sperm attraction by egg chemicals, is widespread but its role in intraspecific sperm competition is debated.
  • Broadcast spawning species offer tractable models to study gamete-level sexual selection.

Purpose of the Study:

  • To investigate the role of sperm chemotaxis in moderating intraspecific sperm competition.
  • To provide direct evidence for gamete-level sexual selection mediated by differential sperm chemotaxis.
  • To explore if egg chemoattractants selectively attract sperm from compatible males.

Main Methods:

  • Utilized a fluorescently labeled mitochondrial dye to track real-time sperm fertilization success in mussels.
  • Employed genetic markers (nuclear and mitochondrial) to infer male-female genetic compatibility.
  • Analyzed competitive fertilization success in relation to sperm chemotaxis.

Main Results:

  • Demonstrated that differential sperm chemotaxis directly moderates competitive fertilization success in a broadcast spawning invertebrate.
  • Observed that egg chemoattractants appear to selectively attract ejaculates from genetically compatible males.
  • Findings suggest a novel mechanism for gamete-level sexual selection.

Conclusions:

  • Sperm chemotaxis plays a significant role in modulating sperm competition, impacting fertilization outcomes.
  • This mechanism may contribute to sexual selection by favoring sperm from compatible mates.
  • The findings have broad implications for understanding reproduction and sexual selection across diverse species, including humans.