Skeletal Muscle Contraction: Mechanisms and Responses

Posted by on Jan 13, 2025 in Human Biology | 0 comments

Depolarization of skeletal muscle is caused by a(n):

  • Influx of Na+

True

The voltage at which the first noticeable contractile response is obtained is called the threshold stimulus.

  • True

Tetanus

A muscle contraction that is smooth and sustained as a result of high-frequency stimulation is tetanus.

Oxygen deficit in the tissue after prolonged activity

Muscle fatigue, the loss of the ability to contract, may be a result of:

  • Oxygen deficit in the tissue after prolonged activity
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20 volts

According to the data,

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Comprehensive Skeletal System Anatomy

Posted by on Jan 10, 2025 in Human Biology | 0 comments

Skeletal System Model

System Model: Osteon, Lamella, Osteocyte, Lacunae, Canaliculi, Central Canal

Bone and Cartilage Slides

Compact Bone (Ground Bone): Osteon, Lamella, Lacunae, Canaliculi, Central Canal

Hyaline Cartilage (Monkey Trachea): Chondrocyte, Matrix, Lacunae

Bone Types

Compact Bone: Dense and hard outer bone layer.

Spongy (Cancellous) Bone: Less dense, porous inner bone layer with a lattice-like structure.

Bone Structure

Diaphysis: Long, tubular bone shaft primarily composed of compact bone.

Proximal

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Brain Structures and Neural Pathways: An In-Depth Look

Posted by on Jan 8, 2025 in Human Biology | 0 comments

Hypothalamus

Afferent Connections:

  • Medial Forebrain Bundle: Continuation of the longitudinal dorsal fasciculus.
  • Solitary Tract Nucleus.
  • Fornix: From the hippocampus to the mammillary nucleus.
  • Thalamus: From the retina and cortex.

Efferent Connections:

  • Telencephalon: Amygdala and hippocampus.
  • Thalamus: Anterior nucleus.
  • Pituitary: Downstream efferent pathways (hypothalamic-spinal, hypothalamic-bulbar, hypothalamic-periaqueductal; mammillotegmental tract).

Pituitary Gland

Irrigation:

  • Neurohypophysis: Inferior
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Bone and Muscle Structure: Functions and Types

Posted by on Jan 7, 2025 in Human Biology | 0 comments

Functions of the Bones

  • Maintenance of different positions, the realization of movement and displacement.
  • Some participate in protection by forming cavities containing organs.
  • Participate in the production of blood cells.
  • They are an important reservoir of minerals for the body.

Bone Classification by Structure

Long Bones

These are bones in which length predominates over width and thickness. They participate in the support of the body and allow for its displacement. They are formed by two heads on the ends

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