di Mara Antonelli, Donatella Cabrini, Mauro Cattaneo, Alice Cipolla, Marco Giovanni Santagostino Baldi. S.I.L.S.I.S. Pavia a.a. 2006/07 Indirizzo Scienze Naturali Classe A059

20 ottobre 2006

Due prove sperimentali

Esperimento: metti in evidenza le vene di un braccio

Procedimento:

  • Tieni un braccio disteso lungo il corpo.
  • Con l’altra mano stringi con forza il braccio disteso, fra gomito e spalla, per circa 20 secondi.
  • Se non riesci, fatti aiutare da un compagno, o utilizza un fazzoletto.

Osservazione:
I vasi sottocutanei del braccio compaiono in rilievo.
Osserva le loro caratteristiche: le diverse dimensioni, le ramificazioni, il colore ecc.

Esperimento: Braccio su e braccio giù

Scopo:
Avere evidenza della circolazione del sangue nel tuo corpo.

Procedimento:

  • Solleva il braccio destro e tienilo puntato verso l’alto.
  • Lascia il braccio sinistro disteso lungo il corpo, puntato verso il basso
  • Mantieni la posizione per circa 30 secondi

Osservazione: Le due mani hanno un aspetto diverso.


Descrivi le differenze e prova a spiegare il perché lasciando commenti sul Post.

2 Comments:

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